I sold my 6D and all my canon gears 2 weeks ago... I'm in a phase where I am pissed at Canon (it happens in cycles). not sure if I'm gonna switch to Nikon (I tried the D750 with sigma Art 35mm and I was really impressed) or Fuji (considering XT-1 with 3 primes)... or maybe wait for the first quarter of 2015 to see if a new Canon system/mount comes out.
What I can tell is that if you get the 6D with the 35mm F2 IS you will have a great combo!
+1. Feels also very good balanced