I'm new to photography but have heard so much about L lens. Currently have the
75-300 III but is quite disappointed with the results. I'm hoping to get the above lens but
is not sure of their main diff. Could some pro explain to me please? Initially I've thought of
EF 70-300mm f/4-5.6 IS USM as its much cheaper but is there any significant difference in image quality over the 75-300 mk. III? Thks for replying!