Hello, Im new here, this is my first post and I already have a doubt for you guys... I have 3 L lenses and 2 Sigma EX DG lenses, now I have the opportunity of getting a Sigma 300mm f/2.8 EX APO HSM NON-DG, for a reasonable price, but I dont know if this is worth it, cos its not the DG version. Its not a "used" lens, its a demo from a store, so it's not really used. The price is good, but I dont know if I should go for it. May I add, Canon lenses are totally out of budget right now... even used ones. And I need the f/2.8, cos I use it for sports. Do you guys have a preference when it comes to the Sigma 120-300mm f/2.8 and the Sigma 300mm f/2.8 prime? I will also use it with a 1.4x extender, so I thought the prime would be a better option, but I wanna know your opinion. Please, share your thoughts with me. Thanks!