Yes. Obviously, the loss of 0.45 stops is crippling. At least, f/number stops. Probably less loss in terms of light transmission, the difference between the EF 85/1.2L II and EF 85/1.4L is just 0.1 T-stops, for example. But still crippling.
Furthermore, the razor-thin DoF one can achieve with a 35mm lens (when the front element is almost pressing against the subject) will be massively affected by that 0.45 stop loss.
Just another case of Canon’s cripple hammer. Only the suckers will buy the f/1.4 version. Real
men photographers will hold out for the vastly superior, non-crippled f/1.2 version. Even if only to buy it for their real
men photographer kids since they’ll be too old to lift it when it finally arrives.
Except we
know it’s not crippled. How? Because even
@roby17269 said he might buy one!