I have a MBP, 8GB, 2014 now and I'm happy. I also have a thinkpad t500 but it has a dual core so you can't compare it.
The thinkpad is more of a rough notebook for a FabLab or when you are on the road and it can get dirty.
The MBP is lighter and very powerful considering its size. OS X works like a charm for me and I've been through many different OS'es so far (Win XP/7, Ubuntu, Debian, Manjaro,...). It provides most of the stuff I need for working, photoshop runs out of the box and some of the Mac tools are very handy.
But I wouldn't trust OS X for security means. Therefor I'd use a TP with Linux. I would use this for things like online-banking and private stuff.
I decided to take the marketing in my own hands and now have more control over it and reach the right people.