Well I have heard that non L lenses are hit or miss. Some are sharper than others. With the lens I purchased, it wasn't very sharp and it also suffered from a lot of CA. I'll let you decide. Here are a few photos. First the non-L version. I took several from several angles but none would be worth keeping The next 3 are with the L version of the same lens. the 2nd one against a bright sky is cropped but virtually no CA in the L version and tack sharp. In the last 3 photos simple slider adjustments in lightroom.