I've never seen a K-7 or K-5 but I expect the K20D is similar although not 100% coverage.
The vignetting is due to the point-and-shoot camera I used, it doesn't vignette at all "in reality."
But definitely with the magnifier, you can't see the whole frame if you wear glasses.
I got to try a 5D for a while.. the viewfinder was almost exactly like that on my old film EOS Elan II. In other words, fantastic if you're used to an APS-C DSLR, but pathetic compared to a Spotmatic! (or even to my Pentax P3N).
That said, the K20D has the best APS-C viewfinder I've tried.
But I've only tried the K10D, K20D, Nikon D40x, Canon 350D, 400D, 40D.
Last edited by orly_andico; 01-04-2011 at 11:44 PM.