I probably don't know what I'm doing still, but I've owned both the 85mm PC-e and the 24mm PC-e for about four years. I've just started shooting landscapes (night cityscapes really) and I really like my 24mm PC-e for this. I do notice softness in the corners a bit, sometimes. And the shift lock knob is a joke. It's useless.
But optically, it's very similar to my 24mm 1.4g stopped down to f5.6. If canon makes them considerably better, they must be really amazing. Maybe I lucked out and got a good one. Or maybe I just remember how crappy my little 24mm f2.8 AI-S was in the corners and I just can't complain.
I'd like to see a 17mm t/s. I'd buy it. I'm not sure how often I'd use it, but probably pretty often if it was good optically and I could get a polarizer on there.
I'm not sure what all of this 28mm and 30mm talk is about. I love 24mm. Those other lengths are really really close. I don't understand why they matter. But then, I mostly shoot primes, and 24mm and 85mm are the only two focal lengths I really love. Well, I love 200mm too, but I need a ham radio to direct the model at that length.
