What focusing screen do you have on it? If it's standard then an upgraded one (acute matte or acute matte d) makes a big difference to the ease of focusing.
I upgraded to a split focusing screen which does help but still find it's not the easiest thing to get pin sharp.
@jambon started
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What focusing screen do you have on it? If it's standard then an upgraded one (acute matte or acute matte d) makes a big difference to the ease of focusing.