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Canon 5D mark III + Canon EF 85mm f1.2 @1/100 f1.8 ISO100
One light setup: 90 cm deep octa 0.5 m (pointed down at 45degree) and silver reflector to fill shadows a bit..

If the model were female, would you do something different?
I heard that many photographers prefer to shoot male models without a diffusor.

Hi, no, i think that it depends on what do You want to achieve. If You need stronger contrast You can remove first layer of diffusion. If Your model have a bad skin, maybe You going to use even more diffusion layers (maybe some white paper or other diffusion material).
I like harsh light, so if I using octabox, often i remove first layer of diffusion.

great portrait

Apart from perfect execution as always i like this one for the expression :) Nicely done.

Thank You!