I know this may sound silly and I read countless threads comparing the two but I have the option of doing a straight trade, giving up my 24-105 for a 24-70 f/4 from a local. I read the the price difference was one of the main factors people stuck with their 24-105 but price isn't a factor in this case. I've read the the 24-70 has marginally better IQ and less distortion at 24mm but that it is also soft at 50mm. Any advice would be appreciated 

