Regarding Tony Northrup - he puts out "clickbait" type videos about once a month to elicit a response in traffic. It's a good model for him because he can spread the effects of the video after he either plays victim to the backlash within the next week or two or has people agree with him and turn it around to spread the idea that people interested in the camera are a "handful of crazy people." Either way, "he wins" on some level. Personally, I've written a long response in the past to one of his videos that highlighted this exact thing and WHY he receives the response he gets by making bold blanket statements that are more subjective to the user than factual across the board... and how many photographers across the world do things with "lesser cameras" by finding workarounds. IMO there's no doubt that things like advanced subject tracking, eye AF, advanced video features, etc. in premium cameras make the jobs easier (provided they operate as advertised) but I've shot concerts with Leica M's, Safari's using manual focusing lenses for 90%+ of shots, street photography with telephotos, and all kinds of things I wasn't supposed to be able to do (according to some) without electronic aids. All that being said, I'm in a position financially to afford higher end cameras so that's the route I usually take when the upgrade is actually worth it to me for what I personally do and many of the electronic aids like Eye AF are invaluable to me in many areas now that I'm used to it. For me it comes down to I can offload worrying about focusing and spend that time getting a few extra shots with different framing within the same time constraints because I do have a level of trust for my gear. That's really the underlying purpose of higher end gear - to make it easier to get THE shot.
One of my personal internal goals is to reduce the negativity around me because there seems to be way too much of it worldwide in real life. The last thing I want/need is to have to see/hear it online in my free time... so I'm taking a more solutions-oriented approach - even in my critical discussions. It's easy for me to pick apart most cameras on what's lacking but I stand by my consistent thoughts that there aren't many bad cameras these days... just a lot of subjective deal breakers across the board based on the user.
Regarding the Lumix S series here are my initial impressions based on the information passively absorbed (and forgotten) thus far.
Image Quality: The JPEG engine seems to be pretty good and exactly what I'd expectfrom a "FF G9" if you will. There seems to be a good amount of dynamic range captured in many of the landscape shots and shadow recovery (based on hands-on impressions) seems to be good even within the JPEG's. Most people also commented on the excellent color and black and white profiles that don't seem to require much editing and this is a thing I've always liked about Panasonic cameras going back 10+ years to the G1 for me.
Regarding ISO performance the S1R is relatively clean at 12800 and usable to 25600 IMO. The S1 is relatively clean at 25600 and still usable out to 102400 IMO. This is a great thing as it puts the high ISO performance roughly a stop ahead of the direct competition and makes the reality of the f/4 lenses available at launch matter just a little bit less as of now.
Body: It's a mixed bag but most things have been extremely positive when it comes to the build and the size of the body when used with the lenses that are on the larger side of things. This is probably my biggest "complaint" of my Sony system in that I feel like the grip is always "required" if you've limited your kit to the Sony Zeiss or Sony GM lenses as I currently do. Another highlight is that the layout and haptic feel of the cameras has earned high marks from the testers that come in a variety of sized from average sized women to larger men (I'm 6'3" and about 230 so I like some size). It seems like many in the industry are driving the point that there is room for some larger mirrorless bodies when professional photographers are the primary demographic. Again this camera continues the "FF G9" brand ethos and design.
Lenses: Mixed bag from those that have not used them and mostly positive for those that have.
In short, those that have used them stated that they are high quality and cover the basic working range of 95% of all photography with the obvious omission that none of the lenses will fully satisfy landscape or wildlife photographers just yet. The Lumix S Pro lenses (currently the 50/1.4 and 70-200/4) are "certified by Leica" and in that regard, it is clear that Panasonic and Leica didn't want to create any confusion in L-Mount lens pricing strategy between Panasonic branded Leica lenses and actual real Leica lenses.
The seemingly loudest voices with the boldest statements tend to be the ones that haven't used the camera or lenses (per usual for the internet). A lot of this is coming from a place of old guard thinking based on how Canon and Nikon structured their own lineup with faster/more exotic glass being the "pro" lenses and slower apertures representing "consumer" grade lenses... in their eyes. It's a huge reason why some people gave Nikon "grief" for introducing f/1.8 lenses or balk at Sony pricing the 55/1.8 at $999 at launch when their old "nifty 50" only costs them $150... well all lenses aren't created equally but I'd agree that there is a point of diminishing returns as you go higher end in ANY market. A Mercedes or BMW isn't three times as reliable as your average Honda, Nissan, Toyota, etc. but you pay for prestige, a level of luxury, the name, and the premium service experiences. The Lumix S Pro 50/1.4 will likely approach or maybe exceed Zeiss Otus performance but the Sigma Art 50 comes close too... the point is to pick what works for you but I expect a lot of the higher price of the lenses is that they are designed to be optimal for photo AND video. No one that I'm aware of (besides maybe Sony thus far) has kept this part of mirrorless lens design for hybrid shooters in mind like Panasonic.
Regarding the pricing on the body and lenses, I'm sure there's an "L-Mount licensing tax" that Panasonic and Sigma will likely have to pay Leica to remain within the alliance. It is what it is and the price is the price. If one can afford it then great but if not there are other capable FF options from other companies.
Features: I'm not a huge video guy but the features provided seem to be capable with a few workarounds. If the video performance is the primary concern the GH line may still be better... or just invest into a dedicated video camera and stop compromising as much. One exciting thing is that this camera will receive access to the paid V-LOG upgrade (what's in the Panasonic Varicam line) and not V-LOG L (whats in the GH line) so that tells you where they eventually see the Lumix S series going and which market it'll play in.
EVF industry and class-leading... nothing else needs to be said.
Battery life... this may be the most power hungry camera on the market as it has a battery with nearly 50% more amperage capacity than generation 3 Sony bodies and almost half the CIPA rated battery life it seems. Thankfully there are multiple powering options through USB, camera grips, and battery packs. Not a serious concern of mine personally as I'm not a high volume shooter usually unless it's a wedding.
One thing that got me extremely excited in the leaked specs (prior to official announcement) was the inclusion of 2:1 and 65:24 crop in camera. Been asking for this from Sony in their R bodies for a good 2+ years now... still hasn't happened. Igenerallydothisinpost when wanted for some shots but having it in camera so I can get the framing right in camera is huge.
Autofocus... the biggest elephant in the room and my own biggest personal concern. I have no doubt the Autofocus will be adequate most of the time for stills but in the video department, the CDAF fluttering/pulsing/pumping can just be distracting. Panasonic really either needs to begin incorporating PDAF or find a way to solve this issue with autofocus lenses (yes I know using manual lenses corrects the concern).
Competition: My first thought when these cameras were announced and seeing the general praise they've received by actual users is that Panasonic JUST gave Sony permission to answer with R/S variants of the A9, then gave CaNikon permission to release higher-end RF and Z camera variants sooner rather than later. This is a great thing and one of the reasons that I'm going to hold off until the summertime at best before seriously considering any switch from Sony (and also because I feel like the cameras won't' do as well commercially as Panasonic hopes initially until some price drops/rebates happen). The bottom line is that people have yet another serious option to cross-shop in their research so while I don't agree initially that this is really "full frame without compromise" (because nothing really is uncompromised) I do feel like this may be full frame with minimal compromises.