I like shooting film, and I got my first Auto Focus SLR, an EOS 100FN with an EF 35-80 F4-5.6 kit lens last week, mainly for photographing the kids on bikes & running about. Other posts here rate that kit lens as a very poor one. I have another 2 lenses: Canon 28-80 1:3.5-5.6 IV Ultrasonic Sigma 28-200 1:3.8-5.6 UC Both clean and in good shape, fortunately picked up for a fiver the pair. So in the 35mm to 80mm range that I use most, say at 5.6 to F11, is the Sigma likely to out perform the Canon for sharpness and colours? Interestingly, at 80mm, the Sigma opens to F4.5 until 85mm, whereas the Canon stops down to 5.6 from 60mm or so. This is my outdoor, lots of light camera, to be used with slide film (Kodachrome is my current favorite). No low light requirements. Any thoughts please?