I'm a stage photographer.
Last year I had an issue when doing work for a dance company. Their last production used a big LED screen for their background.
I used a Sony A7 III with 70-200 GM and my friend used a Canon EOS 6D Mark II
I used 1/200s shutter speed (to avoid motion blur with the dancers) and my colleague used 1/125 speed.
Mine looks sharper on the dancers, but terrible with the background, and his photos aren't sharp enough, but the background looks nicer.
Is it because of the camera model? Mirrorless vs dSLR? or mainly because of the shutter speed?