It's fun to mix and match. I've been playing around with the Panasonic GH5 cameras for a week or so and have found the Olympus Pro series lenses I bought to be amazingly sharp. Same with the Panasonic 8-18mm lens, but I felt the need to fill in with some speed in the portrait/short tele area of my lens kit for these cameras. Having already dropped kilo dollars on the basics for the system I was reticent to drop more cash on something stop gap (saving up for the Nocticron...) so I rummaged around in one of the equipment drawers and found my Zeiss 50. I just happened to have an adapter to mount it onto m4:3rds cameras and in moments we were all hooked up and on our way.
Early on I decided that I'd like to try shooting the lens close to its maximum aperture because that's where I thought I'd get the most use out of it on real shoots --- as the lens to grab when I need an extra stop of light, or a little less depth of field, when shooting available light. I pretty much stuck to f2.0 and f2.8 and enabled the GH5's automatic shutter selection. This would allow the camera to switch to the high speed, electronic shutter when the light levels maxed out the mechanical shutter's 1/8,000th.
Most of the sunlit shots sent the camera into electronic shutter territory. The one just below, shot at f2.0 required 1/32,000th of a second exposure. I hardly worried about subject movement with this shot.... But what I was interested to see was the lens performance on a sensor much smaller than the original 35mm frame for which this lens was originally designed.
I was pleased....
The camera and lens handled each other beautifully.