I'm a bit clueless as to where I would some Japanese food in the CBD and stumbled across Cafe Delore's. They make a pretty decent kastsu chicken, and the portion was quite large. It came with a nice serving of steamed rice, a bowl of miso soup, the katsu chicken and a serving of cabbage (or something similar) I think. The staff are quiet but friendly and polite. A nice quiet corner to have lunch in.