Never owned the 7D, but as far as the 6D goes i have no complaints, i moved from a 5D MKII to the 6D mainly for the center point sensitivity and the ISO capabilities. Initially i thought i would never use the WiFi feature but as time has gone on i've found it to be a quite valuable tool. I keep it connected to an Ipad on shoots while my wife/assistant keeps an eye on things that i might miss while firing away (eg. a branch growing out of the side of someones head).
We've also been using the EOS app more while on vacation in trying to be creative, not that i don't trust some random stranger to snap a half decent pic
but i prefer to take my own pics if possible 
Like on a beach in Tahoe where we were the only ones there for example...
Just my .02. YMMV


