Nice opinions guys . It's been said by many professional photographer to go for canon because canon has alot more 2nd hand lenses if you can't afford first hand lenses and in addition there's more places renting out canon lenses compared to sony . A downfall for sony maybe it's because of the build quality of their carl zeiss and pro G lens . Dont get me wrong , they got good build quality but not that weathersealed . Maybe because of that , lens rental shop are afraid to buy sony lenses to rent out as it may tend to get damaged easier . Not mentioning all the dust particles that get stuck at the zoom ring . But comparing canon 24-70 f2.8 and sony zeiss 24-70 f2.8 i dare to say confidently that sony zeiss has a much better quality glass , it's just that sony cameras and lenses are not really designed for REAL pro usage . Maybe sony should just let carl zeiss itself design the whole lens .