Resolution: Excellent in the centre at f/2 and improves with stopping down to f/4. The resolution part-way and in the corner increases to a maximum at f/5.6 and is still quite good at f/8

Chromatic aberration: Modest at f/2 but very low stopped down.

Vignetting: Very low when stopped down to f/4

Macro Sweet Spot: f/5.6-f/8