A new full frame from Canon is coming, whether it's a 5D Mk IV, or a new line 2D, 3D or 4D, I'm not sure, but the price drop tells me they're going to fill the hole between the 5D, and 1DX with something.
IQ is a was between the Sony, and the Canon, the Canon has much better AF, Optical Viewfinder, no semi-translucent mirror, and a better lens line-up (although the A mount line isn't bad, it's not on par with CaNikon), but the Sony is cheaper, but the Canon will come down in price as well.
Iq is actually a bit better in the Sony -- especially dynamic range at low ISO.
AF is possibly a wash or slight edge to the Canon.
The translucent mirror is an advantage to the Sony -- as it allows a vastly superior live view, not even close in that regard.
The optical viewfinder is a disadvantage for the Canon, but it's pretty subjective. I changed from Sony to Nikon -- I'm happy with the change, but I miss the Evf quite often. For 90% of shooting, EVF is just better.
Canon does have a much better lens lineup, but among Aps-c lenses, it's actually pretty close.
And the Sony can do 12 fps, though with some limitations.
So advantages of the Canon 7dii:
Possibly slightly better tracking af. Slightly better lens lineup. Optical vf better for tracking action. Gps.
Advantages for the a77ii: slightly better iq. Far better live view. Great EVF, which I find better for everything except tracking action. Slightly faster burst rate, but only with auto exposure (same burst rate otherwise). Wifi. Fully articulating lcd. And half the cost.
For "general purpose" shooting, I'd take the a77ii -- for the Evf, higher image quality, superior live view, and cost saving.
For sports specialization, I'd take the 7dii for slightly better af, better sports lenses, and for ovf which is better at tracking action.