Who said anything about Japanese knifes? Lets be honest - most people just want a sharp knife and that's it. 99% of people aren't going to get all worked up over whether a blade is sharpened at 15 degrees or 20 degrees. Almost certainly no one will know the difference.
Sorry, perhaps I should have been clearer with my original question - Im looking to get my Japanese knives professionally sharpened at the correct angle

Not having a go at you booyaka btw

, i'll cover your time as well. It will be a while off yet as its too cold to venture into the shed at the moment. I'll give you a bell nearer the time.