Well adapted glass doesn't work very well on head on bikes!!! The latest EF 300 f2.8 IS L MKII just wouldn't track so need to start saving up for the 70-200 f2.8 first i guess.
Did result to a not very reliable way of pre focus again and was impressed with the detail of files even compared to my 1DX MKII.
Found eye A/F very hit and miss using Canon glass on the grid also but when it worked it was brilliant but when it didn't i just wouldn't regain focus for ages.
Still early days but may have to juggle some Canon glass around and replace with native Sony,will hire some for my final outing this season at Brands.
Few little quirks compared to the Fuji X-T2 as seem to keep adjusting the volume every time i scroll through images at the moment and the
size of the single A/F point is bloody massive LOL.
Detail from the sensor is incredible and the colours are a lot better than i expected.