wiltw, you are correct, one shouldn't say "the difference is only 15mm" when this already makes a factor of 1.3 in focal length. It's already helpful for me to know that others, too, see a marked difference between the 50 shots and the 65 shots. What puzzles me is that the 65 is not just less of a 50, it seems to play in a completely different ball park. Somewhere there seems to be a pronounced step in our perception where our brain switches from "this is a typical wide angle shot" to "this looks normal". I would have expected the transition between these two a little bit more subtle and smoother.

So the decision between the 50 and the 65 (apart from technical merits which have already been beaten to death in the equipment forum) seems to boil down to "do you want your images to look like wide angle images or do you want a normal looking image with more stuff in the frame than the 110 gives you" ...