Since I got my mk iv, I changed up my lens selection and now have the following lens'.
Sigma 12-24
Canon 17-40
Canon 24mk II (on the way, should be here today)
Sigma 150-500
Would you keep the 17-40 or get rid of it due to overlap. My next lens would either 24-70 or 24-105 (that is a whole 'nother debate)

