Yes ... sort of.

Its not really a behavior, in the sense that magnified MF does not cancel peaking but peaking is often barely effective with the magnifier enabled. Take aim at some very contrasty hard edged details and you will rather likely detect a bit of peaking.

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Im quite pleased with that situation. I have some cameras that show plenty of peaking when magnifying for MF, and I hafta cancel peaking if I am relying mainly on magnified MF. Heavy magnified peaking obscures fine details as it comes ALMOST into focus, such that you cannot see to finalize EXACT focus.

IOW, peaking is best for a quick focus thaz sufficient with smaller apertures, but its a liability during the really critical magnified focus thaz needed with wider apertures.

After years of using my favorite M43 Camera the Olympus OM-D E-M5 II which I said I would never replace I came across an OM-D E-M1 II for a really good price and as it came with the box and other stuff along with a Sigma 30mm f2.8 I went for it.

Wow, what a camera this is, I am now torn about selling on the Sigma lens but after taking a few shots with it it is incredibly sharp and, well, it's a weird focal length that doesn't fit well with what I do. It's a light plastic lens with a metal mount and it rattles when not connected to a camera that is switched on and was wondering if I should just sell it on or keep it just in case?

It's a Sigma 30mm f2.8 EX DN and made for M43 and another format which I can't remember for the life of me.

Has anyone else had any experience with this Sigma lens?