When begins an era, of producing dedicated sensors with electronics for specific lenses?
NOW obviously..just look at the "incredible" Canon M on the 800mm.
(notice...I can't say the Canon 800mm on the Canon M! LOL!)
5D Mark III, Canon 15mm f/2.8 Fisheye, Canon 16-35mm f/2.8L II, 21mm f/2.8 Zeiss, Sigma 35mm f/1.4, 24-70mm f/2.8 II, 50mm f/1.4 Sigma, 85mm f/1.2L, 100mm f/2.8L Macro,70-200mm f/2.8L IS II...1.4x converter III, and some other stuff!