I agree with you that 'as if' was repeated too often - as was the word 'grave'. And, like you, I also found it frustrating that Konrad rarely spoke and that his perspective was consequently lacking. Perhaps the one-sided nature of the conversation is a reflection of the relationship between Henrik and Konrad (from Konrad's perspective) and Henrik's marriage (from his wife's perspective)?
Regardless, this book made me stop and think in several places, and I would definitely recommend it to certain types of friends and read it again at a later date. I'd probably have given it 7/10 if possible. In its original language it might have warranted 8/10, but the repetitions let it down.