I currently own a Nikon D7000, Nikkor 17-55mm f/2.8 and 50mm f/1.8, and Tamron 70-300. It's great kit but I'm getting tired of lugging it all around. Will I get comparable overall quality and especially IQ from the NEX-7? Should I count on Sony/Zeiss for more pro-quality lenses, especially primes, in the near future??