Hi everybody. I know these sorts of threads have been beaten to death, but I am sitting on the fence as what to do with my Sigma 50mm f1.4. I bought it second hand and made sure to ask the seller if they thought it was sharp etc and they said yes it is quite sharp (they shoot with many L lenses, so that was good enough for me. They also sent me 3 photos and they looked great, at f1.4. However, I have been comparing my f1.4 shots to those of f2.8 etc and f1.4 looks incredibly soft. I have tried manual focusing and that does not seem to make my images sharper at all, so focus seems spot on to me.
Here are some shots I have taken. The two of the 50mm f2.5 were outside at about 5pm and the pictures of the Solo can were in my room with my computer monitors and bedroom light on (sat camera on desk and used remote trigger so no camera shake would be possible). I have not bothered so far with any non cylindrical objects due to the fact it is very obvious there are some issues at f1.4 even with manual focusing. Also, CENTRE focusing point was used.
Links below for full resolution (fingers crossed you can actually view these)
Any help would be appreciated, thanks