Just watched episode 4 of season 2, the one where Marcus goes to Copenhagen to work with Will Poulter (who is wonderful in this short guest appearance), it's a perfect representation of why this show is so incredibly good. Just through the subject matter at hand (food, and Marcus perfectioning his techniques), you get so much depth for all characters involved - the way his friend brings him to the airport, his exchanges with Chef Luca, his phone call to Sydney, the pictures he takes for his unconscious mom... Every character is more fleshed out than in so many other shows. It reminds me of The Wire or Mad Men in its attention to character building, it's so wonderfully well done.
It's truly becoming one of my favourite shows.