I am leaning towards Sigma 50mm due to its optical quality and built. But then this focusing issue I hear about really bothers me. I never had any focusing issue with all my lenses so far. So my questions are:
1. How easy is it to send the lens back in case of a focusing issue? (Edit: I meant send it to Sigma for calibration)
2. Who pays for the shipping, insurance etc when the lens is under warranty? and
3. What are the chances that the lens will still have focusing issues even after repair?