Sharp at the corners, colours are represented well, and a wonderful viewing range for street and documentary photography. A great lens and one to keep for decades. The only downside would be the slow focusing in low light.
Cheap flux, helps with soldering. Unfortunately the pen is terrible to use. The nib is extremely stiff, with no spring action. Depressing it allows the flux to flow and there's no stopping it unless it stands upright with the nib facing up. A terrible flux pen - buy something else.