Installed 0.85 firmware today and made 2 consecutive calibrations. I did the same with 0.81 and 0.82 in order to compare results and have a better understanding.
You can see the fitness and coordinates values at each step. Last 2 columns are real measurements of a 500*500mm test cut, I did not do it every time, although it’s one of the best performance index in my opinion.
0.85 definitely improved fitness: from ~0.78 (0.82 version) to ~0.93 mean, and lower variability in points coordinate results between different identical calibration. So a clear improvement from a calibration point of view!