Newbie here, having problems with my 5D3 images, was shooting my first time indoor arena, daughters ice skating practice. Operator error, or do i have a faulty camera, all my images are a bit graineier than i would want to be honest, and all seem a little soft, this is one of the better ones, Ive had the camera since beginning of april, but this is the first time I've had to use it in low light, i seem to remember my 5D2 looking better and sharper with same lens at ISO5000 with Jpeg when shooting some Martial arts, should i demand a fix/repalcement?