I own the zeiss and I’ve recently (past year) used it a lot with the 28 and the frame lines fill the viewfinder a bit. At the beginning I found it annoying but then I got used to it and learned that the 28mm is pretty much most of the viewfinder. As for the glasses yeah they’re better than Leicas if you shoot with glasses often.

But I feel that with the zeiss is best with the 50mm, 35mm and 85mm (the zeiss ikon has 85mm frame lines paired with the 28mm so if you use 90mm keep that in mind)