Just finished chipping my 14mm with a Canon EMF AF chip
I had to make a spacer to get the chip's contacts to the correct height, but after that installation and configuration was very easy.
Works like a charm! Very handy to have aperture and focal length data in EXIF. AF confirm and AF adjust also works, but because the DOF is so large there is quite a lot of margin. Live-view x10 works better
I find the focus ring a but spongy, there seems to be a bit of a dead area before it catches and changes focus, is that normal?
I also made a spacer, much in the same way. No complaints about my focus ring, it operates smoothly not spongy.
5D3, 5D2, G5X, G16 | SY14/2.8, V20/3.5, 28/2.8 IS, Ʃ35/1.4, 50/1.8, 50/1.8 STM, Ʃ50/1.4 EX, 100/2.8L IS Macro, 16-35/4L IS, 24-105/4L IS, 70-200/2.8L IS II, 1.4x II, 2.0x III, T28-300 VC PZD, 70-300L IS, Ʃ150-600 OS HSM S