So I've been thinking about getting an A7. I've been curious about full frame. In a perfect world, the money tree would cough up wads and I would get the A7RII. Being that it is an imperfect world, I need to lower my sights. I currently shoot with an a5100 and I love it, but I want to play around with full frame. The A7 seems to be an economical entry point into full frame (around $700 on eBay) not taking the lenses into account; I will stick with my vintage lenses for a while. I shoot mainly people, pets, and still life and mostly with primes as I have not invested in a quality zoom. Not so much quick stuff, and only the occasional landscape. A little macro here and there, nothing crazy. In your experience, how much of a difference will FF make?