For my cameras, l like the viewfinder on my Canon New Canonet QL17 a lot. It's big and bright and clear, even with glasses. Next, I like my Bell & Howell Dial 35-2 hall-frame (made by Canon too), also because its viewfinder is big and bright, even with glasses. My Leica M3 is a close third, losing out only because its viewfinder seems to have been designed for use without glasses.
At the other end of the things, my Olympus XA's viewfinder and my new Minox 35 EL both have small viewfinders that aren't designed for glasses, especially the XA. Yeah, the XA's viewfinder/rangefinder works OK, but it's not my favorite, and the 35 EL's viewfinder leaves the exposure meter unlit and half out of frame except when viewing a really well lit scene, at least with my glasses on.
I can also see why Japanese SLR's came to rule the market, with their excellent viewfinders. None of my rangefinders or zone focus cameras are as good as my Konica or Canon SLR viewfinders.
Scott