These lenses are focus by wire I read somewhere. Endless spinning focus rings… They're calling that "Master" level now?

http://www.roseandcharles.com/sony-24-70mm-f2-8-gm-review/

Good lenses. But. Sony, why they are so expensive?

http://www.focus-numerique.com/test-3140/zoom-sony-fe-g-master-24-70-mm-f28-test-8.html

I am wondering if there would be any loss of quality/sharpness etc. if using these G Master lenses on a smaller sensor such as A6300? And if so how significant or not?

Centre sharpness remains impressively high through from f/2-f/11, with f/16 being slightly affected by diffraction. The edges aren't quite as sharp as the centre, with f/2.8-f/16 producing the sharpest results

http://www.photographyblog.com/reviews/sony_fe_85mm_f1_4_gm_review/

The performance of the 24-70mm f/2.8 GM is exceptional. It’s the finest standard zoom lens I’ve had the pleasure to use.

http://admiringlight.com/blog/review-sony-fe-24-70mm-f2-8-gm/

Sony 85mm f/1.4 GM vs. Rokinon 85mm f/1.4 vs. Canon 100mm f/2

http://admiringlight.com/blog/sony-85mm-f1-4-gm-vs-rokinon-85mm-f1-4-vs-canon-100mm-f2/

24-70mm review

http://eh-photo.de/blog/81#10