Hi Matus,
You might also want to compare the 6x7 with the optional hand grip. That would add some more mass, but not sure how much more. I believe the 67II has a bit of a different grip than a stock 6x7.
I keep getting a 6x7 and preferring my 645N, selling the 6x7 and preferring (again) my 645N, then thinking maybe I'll 6x7 another shot... Personal choice of course. It is a tough comparison with the 645N's 45-85mm. A great lens although with considerable mass, but the 645N would feel quite different with a prime.
That is my contribution from a convenience standpoint.
Yuri
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