If you like to shoot at f/1.4 to f/1.6, it is usually because you like the blurred background and subject separation. It will be better and typically more pleasing with a FF. I think if you like to shoot wide apertures, it only gets better with FF.

As for the difference just being the same as stepping forward... it was mentioned the perspective may be different. Well that can be a big difference. The angles are different, and may emphasize facial features completely differently. Which is why many like the 85mm focal length... because it portrays the facial features in a more pleasing natural way.

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