Canon 85mm f1.2 L (Mark II) vs.
Pentax SMC-A* 85mm f1.4

Long Range (100m) Performance at f2.8

Extreme corner crops (full frame re-res'd to 6000 pixels)

The test target here a 'domestic scene' at a distance of approximately 100 metres.

Canon 85mm f1.2 L MkII at f2.8 (corner)	Pentax SMC A* f1.4 at f2.8 (corner)

The apparent slight advantage the Canon seems to enjoy here in the corner must be partially offset by the fact that it had slightly stronger, more contrasty light in this exposure, just enough to lift the highlights a little more. In truth, there's nothing to choose between them at this aperture and distance.

Centre frame crops (from full frame re-res'd to 6000 pixels)

Canon 85mm f1.2 L MkII at f2.8 (centre)	Pentax SMC A* f1.4 at f2.8 (centre)

Mercifully, by f2.8 both lenses are largely aberration free. The Pentax still has a whisper lurking at the window's edge, but bear in mind that you're looking at 200% enlargements. Again, the stronger light slightly favours the Canon capture, but I'm not convinced it represents a big score in its favour. Again, they're very close.