So, I need a personal laptop and I think I will go for the 2013-2015 rMBP. I want to go for X1 Carbon but haven't had nice experience with Ubuntu on it.

I looked at the 4 core i7 configurations and they have Geekbench score of 13k-14k. So, doesn't seem that bad compared to the new processors and should hold up on CPU front for three more years I guess.

I had a question to people who use 15" MBPs. Since I am not able to get 13" ones with 16 GB RAM. Are the 15" noticeably bulky and less mobile than 13" ones?