@ Pål Jensen: Can you elaborate what you mean by "better image quality"? I think that might be the point we don’t understand each other.
FF with f/2,2 gives the same DoF as 645Z with f/2,8 (with same shutter speed and equivalent, not equal, focal lengths. For instance 35mm on FF vs 45mm on 645Z)
FF with f/2,2 ISO 1600 gives the same noise level as 645Z with f/2,8 ISO 2500 (with same shutter speed and equivalent, not equal, focal lengths. For instance 35mm on FF vs 45mm on 645Z)
I'm not trying to normalise everything into one format. This is just relative numbers and can just as well be viewed the other way around. Or use APS-C as a comparative base.
---------- Post added 04-20-16 at 10:03 PM ----------
Originally posted by itshimitis Personally I don't get the fascination with only being able to get 1 hair in focus wide open, but that's just me - I do very little in the way of portraiture.
I totally agree on that. Its the same thing with macro photo only to a larger extent. Even f/22 can be way to short DoF. But when shooting larger subjects like buildings, bridges, water falls, night landscapes reflected in water and such, the DoF will be more then sufficient even at f/1,2. If there are moving subjects in the scene simultaneously, like clouds, large apertures are wanted for its light gathering capability (fast shutter combined with low ISO). These are examples where large aperture FF wins on noise and/or shutter speed over the current cropped 645 format.