To me the 14" Pro feels like a brick, the 16" is a veritable paving slab. I want something I can toss in a backpack and not feel it's there, which the Air is still just about light enough for. That may be because I live in a very walkable and bike-able area in Europe, and I do lots of both, I'm sure the trade-offs are different if you drive everywhere.
As for the screen, I think "gimped" is not doing it justice. I regularly use both, the Air's is a very nice screen in its own right and while there is a difference, it feels more like a relatively small increment on something already very solid, at least to me (I don't do any pro photo/video work). Same for the other differences, the Air's speakers are already pretty good, connectivity is fine (for me), I like not having a fan, it's way powerful enough for what I do.
