Love the lens..it can be tedious to use..but the rewards are great.
The grip coating on the lens is one of the many nice assets of the lens.
Yes...you can disable the Electronic MF on a 5D3. Go to the third screen of the AF menu. 1st item.
The MF is touchy..but I leave it on most of the time as this lens takes such constant focus fine tuning when the lens is wide open...(the feel of the MF is floaty to say the least). Sometimes it is just better to turn it off, choose an AF point on the scene and go with AF.
It's always dicey with moving subjects so over shooting is a must to get some shots where you nail it!
It is a fantastic lens. If you need something faster-focusing with good bokeh for action I think the 135mm f/2L is better or perhaps the upcoming Sigmas.
Enjoy the journey...its a lot of fun!!!!
5D Mark III, Canon 15mm f/2.8 Fisheye, Canon 17mm f/4L TS-E, Canon 16-35mm f/4L IS, 21mm f/2.8 Zeiss, Sigma 35mm f/1.4, 24-70mm f/2.8 II, 50mm f/1.4 Sigma Art, 85mm f/1.2L, 100mm f/2.8L Macro,70-200mm f/2.8L IS II...1.4x converter III, and some other stuff.....