For 35mm I like my 105, as it's the longest lens for 35 I currently have. When I had a 135, I liked that. I've used a 180 with great results outdoors, might be a bit long for most studios.

I'll be getting an 85, and I'll like that too. 50 is too short. If you're restricted to a 135 or longer, try using a half or three-quarter profile for less apparent compression if you don't like compression.