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I have the 6d and the e-m5. I had good glass for both systems and found that I preferred the image quality of the FF. The 12-35 was good on the e-m5 but I like the 24-70s better on the FF. I haven't tried the 35-100 but on the long end it's certainly no 70-200 f/2.8 II. The II is simply a great lens!
The e-m5 with anything larger than a pancake is not really a pocket camera unless you're wearing a parka, photo vest or something with big pockets. If portability is what you're after you might check out one of the smaller bodies.