Pricing for the A7 seems to be quite competitive, I guess it will make some competitors scratching their heads. 36MP with the A7r without IBIS will be unforgiving as far as camera shake is concerned. I`m wondering whether the 24MP of the A7 will be the sweet spot, especially also when considering how outstanding this sensor is in the RX1.
You'd better have a very good lens, accurate focus, good IS and/or decent tripod to actually get the extra resolution potential - otherwise you're wasting your money and fooling yourself. There is no free lunch for FF.