They are. I have used both of them, the 50 is quite compact, compare to the Zeiss 45/2.8 lens for 645 or HC 50 for Hasselblad which I also use, the 50mm from Schneider is a lot lighter. The lens hood of 50 and 180 is the same so it is of great convenience when travel. The 180/2.8 lens is wonderfully built, focus fast, sharp, render really nice pictures. Both lenses balance very well on Hy6, all focus very fast. I thought both have been out long while ago.
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Add to that, I would also like to report that the Hy6+e75 is a very effective combination, from my ow experience using it in studio and in location. I have no problem with the screen even under bright sunlight, on beach of Thailand in April, although a lager screen is certainly welcome. And after many years using a angle finder, I am also surprised that the waist level is not as difficult as I anticipate when shooting under direct sunlight.
The camera layout is very easy to work with, AF is fast and accurate, tethered shooting is of moderate speed and I hope the Xposure will speed it further. However when shooting to CF card, the camera is very responsive, easily as fast as any other back I have used.
The overall balance of the camera is wonderful, easy to handle, shoot, check on the histogram, directing the models, back on shooting. The overall control of the Hy6 is fast, changing the setting is as fast as any smaller DSLR if not faster. The rotatable handle is really helpful since many times I was shooting at a difficult angles that will be very difficult to shoot otherwise.
The screen is one of the most surprising feature I found on Hy6/e75 - thanks for the rotation feature of the back. When shooting a 645 format, the viewfinder is restricted to a pre-decided view that sometimes I can miss some important alternative composition; with both orientation of the view both visible on the screen can actually allow me to quickly go for the optimized composition.
I also switched the back orientation often outdoor, on beach or at poolside, found that not to be a problem, once you are getting to it, it is just a matter of about 2 seconds.
Overall, comparing my experience with H3D39 and P45+ on Contax, the Hy6+e75 is a very competitive system and great image quality.
