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I've been using the Sigma 35mm f/1.4 Art for years now and it's consistently been my favourite lens for photographs of people - not just the sharpness which is fantastic but there's also something about the way it renders colours to my eye which seems extremely pleasing, and of course 35mm is a great focal length - not too wide so as to distort and not so long as you be difficult to frame subjects candidly. I'd thoroughly recommend trying it if you haven't.

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Same here, definitely my favorite lens. Out of curiosity how far away from the people are you when you do portraits, and can you share examples?

Wait, lens can affect colours?

Yes, the quality of the glass, number of lens elements, coating on the front element, internal reflections, aberrations and so on. It won't be affecting colors like red turns to blue, but more like red goes to a slightly different muted shade of red.

To expand on this a little: there is no lens which changes the frequency of light. What happens that due to chromatic aberration structures in a given colour could be less precisely focused than others and in the blur a different mix of frequencies (different shade of colours) could appear.

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