What is the resolution of the HDMI output on Olympus mirrorless cameras?

I have an Olympus E-PM2 and would like to know the maximum resolution (and possibly refresh frequency) of the camera HDMI output.

The end aim is to connect it to a high-resolution, high-gamut calibrated monitor (Eizo Color Edge).

I suppose other Olympus cameras (O-MD, etc.) would share the same hardware and specs.

Putting the SD card in a laptop and connecting that to the monitor works well. I’m just wondering what quality I would get if I was to connect the camera directly through HDMI. I was unable to find any answers online and it looks like I will have to get a cable and find out for myself.

I thought I’d ask here first.