One of the best lenses on m43

I've been considering it for use with my Panny G6 and GX7 cameras. Like you, I bought the f1.8 45mm pretty early and have been very, very happy with it. I love it for portraiture; I like its "drawing" particularly, but I have come across a number of situations where I need more reach with no loss of aperture.

The 75 looks good for that. The only competition, from my POV, is the Panny 35-100. I would lose one stop but gain a little more reach and more flexibility. Aargh -- the choices! Right now I am straddling the fence between the two!

You mention that it hunts a bit more than the 45 in AF. I would suggest this is not a problem with the lens it is a problem with the field of view. The longer the lens and the narrower the field of view, the more likely it is that the focus area is looking at low contrast and since m43 cameras are using contrast differentiation, it makes it harder for the camera/lens to find focus.

I have experience this with a number of different lenses in the same situation. I actually came to understand it when I was shooting in the low light of a night club with the Panny 14 and the Oly 45. The 14 was focusing at warp speed; the 45 hunting. The 14 was seeing lots of contrasty edges; the 45 was desperately trying to focus on an area with practically no contrast at all. Changing the position of the focus box to include a contrasty feature (the subject's glasses frame) had the 45 focusing at warp speed too.

Intrigued to see mention of the f2 85. You mean the old Zuiko, right? Lovely, lovely lens. I did a lot of very good work with that and the OM1.