First print. A gcode file that came with the printer. This thing is fast. I had an issue with the homing of the x-axis but that seems to be solved after re-calibrating the printer.
Next comparison of XYZ-cubes. The green one is from the MK4 while the yellow is from the Biqu B1 (basically a deluxe Ender3 clone). What stands out is that it's almost impossible to see or feel the individual layers on the green cube.
Finally the benchy and it looks really good. First impression of the Prusa MK4 is that it works right out of the box. No adjustments or hassle, just slice a file with Prusaslicer and print. Enough for today. Later I'm going to play around with the input shaper and other types of filament (PETG and TPU).