Testing a $100 Sigma 28-70mm f2.8

Headed out for a quick test of my kinda cheap 28-70/2.8 and also compared it to my Canon 24-105/4L.
The sun had almost set so it wasn’t exactly bright outside.

Its a C/Y Mount and can be adapted for both EF and MFT. I guess it would also work with the EF speedbooster.
Its well built but an annoying thing is that the focus turns when I turn the ND unless I hold it.