I would think so, but I've never been impressed with the images produced by my MK3 with ANY lens.
I was expecting great things when I switched from Nikon DX to Canon FF and I've not really found it
The Fuji's continue to really impress me.
The fact they can give better IQ than the 5D MK3 is the kicker (and no, it's not just me, check Scoopit for X-Pro1 | XE-1 to see how many pros think the Fuji is better than their old 5D MK2 or D700. The IQ of the MK3 is about the same as the MK2 - they just fixed the AF and ergonomics a bit).
I just bought a Contax Carl Zeiss Sonar 90mm F/2.8 from the 80s in mint condition from Japan.
This humble lens mounted to either Fuji produces the magic I'm looking for.
Maybe the analogy is more film versus digital?
Fuji developed their X-Trans sensor to mimic the grain structure of film.
It is said to produce film like images.
I'm waiting for the rumored FF Fuji