Hi,
Just to say, I am known as a medium format skeptic. I have been shooting for the last 2.5 years with a Hasselblad V system combined with a P45+ back in parallell with a Sony A99 camera.
What I would say that I did not see a lot of difference between the two system using my standard processing toolchain, LR6/LR CC. The P45+ had an obvious advantage in resolution. Colour is a more tricky thing. Both systems were capable of pretty accurate colour with good colour profiles. Much depends on taste.
What I have also found that the none of the three Distagons I have been trough have not been very good on the edges/corners. My DSLR zooms actually outperform the Distagons on the borders of the image. The Sonnar 180/4 is sharp across the field and so is the Planar 100/3.5. The Planar 120/4 is made for close work and performs well at that distance but has a lot of field curvature at infinity. I had two samples of the Planar 120 a CF and a CFi. I have a feeling they could do with a bit more of contrast. The Distagon 60/3.5 CF is OK, but doesn't keep up with my Canon 16-35/4 at 35 mm and f/8.
I did not see a resolution advantage with the Hasselblad/P45+ combo at A2-sizes, but I think a clear advantage was visible at A1.
Now I have moved to a Sony A7rII, what I have seen is that the A7rII performs on par with the Hasselblad/P45+ combo also on axis (close to centre).
I am using the Sony A7rII with HCam Master TSII, a pocket size T&S adapter that takes both Canon lenses and my Hasselblad and Pentax 67 lenses. That works reasonably well.
So, from my experience MFD is a bit of a looser, unless 60-100 MP is needed. PhaseOne and Hasselblad also have leaf shutters, and there are cases where a leaf shutter is needed.
The Hasselblad V lenses are CF/CFi generation, they were made for film. The new Hasselblad H lenses generally seem to be better, according to MTF curves published by Hasselblad. They seem to be very good.
Something that matters to me is that I can get a lightweight and transportable kit.
I have something like this just now:
A7rII
Canon 16-35/4LS
Canon 24-105/4L (better than it's reputation)
Canon 24/3.5 TSE LII
Sony FE 90/2.8G
Sony 70-400/4-5.6G
Metabones and Sony adapters
HCam Master TS
The above kit fits in a Kiboko Bataflae with some room, and weights around 10 kg, which is weight limit on many flights.
I can also add some MF (Hassy or Pentax) lenses to the mix when weight is not an issue.
Regarding the suggestion that recent MF lenses are better than 24x36 mm lenses, there may be something to it. But there are a lot of truly great 24x36 mm lenses emerging, like the Otus and Batis lines from Zeiss and the greatly improved Milvus 85/1.4 and 50/1.4 and the Sigma Art series.
BUT, if you need 100 MP, MFD is the way to go. With 50 MP I am clearly skeptical and keep in mind that 50 MP is cropped frame MF, 44x33 mm.
I may also add that I am keeping the Hassy/P45+ combo, unless someone gives a really good bid
. The reason is I enjoy shooting with it. It is a great camera giving great images.
Best regards
Erik