I have been really pleased to discover that my pano work is much easier with MFT than with the full-sized APS-C DSLR that I was using.
Let me first start off by saying that I am in the camp that says that it is a good idea to use a calibrated spherical tripod head when stitching subjects with complex foreground. I am a woodland photographer, so that means I very frequently use my calibrated tripod head.
With larger lenses and larger-framed bodies the pano head calibration step is important. It needs to be done for each lens, and for zoom lenses, at several intermediate focal lengths. You also need a large enough bar that allows the camera to move far enough aftward to rotate around the entrance pupil location. With a big lens like a Canon 24-70, that location can move quite a bit.
On the other hand, I have found with the smaller bodies and lenses of MFT, you can eyeball it to the middle of the lens and get, for all intents and purposes, perfect alignment (at least as perfect as I ever got). Furthermore, you can use a much smaller bar because you don't need to move as far aft.
While bigger is better in many domains, lots of stuff gets easier when the camera system gets smaller.