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Thanks very much for the info and linksThe Pentax 28-45mm is ridiculously sharp, I have a few RAWs shot at 28 & 45mm at f4.5 that look sharper than many lenses do at f/8 - All the way out to the corners at that. Here are links to download them, unfortunately I don't remember where I found them:
https://dl.dropboxusercontent.com/u/41183616/IMGP0297.DNG
https://dl.dropboxusercontent.com/u/41183616/IMGP0300.DNG
The 90mm Macro is the other new lens that I feel makes the most of the sensor.
The 25mm prime has been discontinued, but it wasn't a very good lens for the price, so everyone's hoping they'll make a newer, better replacement... hopefully with tilt/shift.
The 55/2.8 is a nice lens, but the corners could be better, they suffer from some field curvature and softness.
None of the old lenses can really resolve the sensor without stopping down, and suffer from loads of LoCA wide open, expect to use CA reduction often. The 150mm 2.8 is a portrait lens, so I don't really expect to be razor sharp wide open, but it does get very good from 5.6 onwards.
If your interest is in something like landscapes, where you'll be shooting around f/11 most of the time, most of the Pentax lenses will do a good enough job.
True, I haven't actually used the 25mm, but I have seen enough images and examples over the years from actual owners to get a good idea of what it's like.Excellent suggestions baring one. I very much like my 25 as I often it offers a better FL than the 28 on the 28-45. 3mm does not sound like much, but for me it makes a difference. Not that K-P did not have hands-on long term experience with the 25 (since he basically a straight shooter from what I read), however many just spew out whatever they have read about this 25 lens without actually having used it.
I just purchased a used 645z, along with a 35 A, 55 DFA and 120 FA. None of them are here yet, but I'm looking forward to comparing them to the A7rII I've been using for the past month with a Canon 24 TS-E, Zeiss 35 1.4 and Sony 90mm macro. There should be some pretty distinct strengths and weaknesses for both, but I'm curious how shooting them both will make me feel. I'm hoping the 35 A delivers, because throwing down the cash for a 28-45 would make the Pentax system considerably more pricey than it is for me right now!