Zeiss ZF 85mm f1.4  vs.
Canon 85mm f1.2 L (Mark I)

Resolution/Performance at f2.8

Zeiss ZF 85mm f1.4 ar f2.8 (centre) 49,999 bytes	Canon 85mm L (Mark 1) f1.42 ar f2.8 (centre) 56,456 bytes

Any fast 85mm is blisteringly sharp by f2.8 – close to its optimal working aperture, and often sharper overall than at f8. Still, the Canon wipes the floor with the Zeiss at close range with this beautifully rendered and ultra-detailed capture, Her Majesty looking simply delightful in this fetching off-the-shoulder number with matching pearls . . .

Zeiss ZF 85mm f1.4 ar f2.8 (corner) 20,556 bytes	Canon 85mm L (Mark 1) f1.42 ar f1.4 (corner) 24,426 bytes

Despite some aberrations creeping in at wider apertures, by f2.8 the Canon L is pretty clean. The Zeiss ZF is still playing catch-up when it comes to resolution. It's much better at longer working distances, but at 1.25m this is a very poor showing for such a pedigree lens.