So far, I cannot recommend this lens WITHOUT adding a Tiffen BPM14 (Black Pro Mist 1/4)...

It is true that this lens has a lot of SHARPNESS and CONTRAST, but when used with this sensor (the Panasonic G85) it does not render a realistic scene. The corrections I am applying (to the NATURAL profile) include an interesting Highlight Shadow curve, but the shadows are still being rendered too dark, but it's the best I can do without making it obvious there was a curve applied. The result is still not as realistic as I would like, and this means it will be difficult to match the shots from this lens to a lot of the other lenses I use (and therefore the imperfect "Real Rating"). All of this makes me understand why people tend to use diffusion filters (such as the Tiffen Black Pro Mist series) on this lens...which explains why the person I bought it from INCLUDED one with it! I hope to test it with that filter, next.

I will say that overall this lens is a very consistent performer as it was difficult to see the difference in quality at different aperture values (unlike like many vintage lenses). The downside of this is that it does lack what some call CHARACTER which is typical of Sigma lenses of this type, but adding the HIGHLIGHT SHADOW compensation does kind of add a bit more character to it (and if you've used the in-camera curves, you know what I mean).

Also, a lot of people talk about how the skintones on this camera are too RED, and they certainly are with this lens too...but keep in mind it is the combo of BOTH the lens and sensor that render colors a certain way (I might actually go back to trying an old Minolta MD 50 1.7 with this sensor again, as that has a GREEN bias, which may compensate for this issue).