Check out the gallery above for some Helios 44M 58mm f2 test shots.
First impressions: it’s way sharper than I expected and I could easily become re-seduced by the simplicity of on-barrel focus and aperture controls. Putting the EM1 into Manual mode and judging shots by the lightmeter also made me very nostalgic. The Helios produces a very pleasing bokeh and though it does flare, it’s easily avoided. Unless you’re going for that flarey, washed out look, of course.
Most of my Oly lenses have easy focus rings but now I’m wishing they had equally accessible aperture control.