Good review! I've owned the Sigma 10-20 previously and from what I've seen of this 8-16, it's far sharper particularly in the corners. The difference of 8 and 10mm might not seem a lot, but it really is HUGE as it's an extra 20% FOV. I purchased a 2nd hand copy of this lens just yesterday and I'm really looking forward to trying it out. Keep up the great work!