@imrehg Focus is easier on the mirrorless cameras :) They give you focus peaking so you manually roll through the range and when you see the stars get a little buzz from the peaking, you know they're sharp.
But sometimes you want the scenery to be sharp instead of the stars. Just takes practice. I also shoot very very wide, with 14mm. Your photo looked like maybe a 24mm with the crop sensor, so really closer to 36mm. You get more latitude with the wider perspective.
What I used to do when I had the Canon 5D was take a series of shots, and slightly nudge my lens focus each time. Then step back through the shots and look to see if the stars get puffy, or get tighter. Puffy means you're stepping away from focus. It was tricky.
Having a nice manual focus lens helps. That 14mm F2.8 by TT Artisan for example is very affordable, and very lovely.