With the exception on Real Madrid, id say PSG have been the most impressive so far, I think you could live to regret wanting them, they have got a lot of quality players these days. Ibra, Cavani, Lavezzi, Motta, Thiago Silva, just to name a few. I'd say they have a much better team than Chelsea do
Best team doesn't always win. Anyways, PSG have been extremely lucky in the cl over the last couple of years. Their only real test was against barcelona and they crumbled when messi came on.
Hardly crumbled, if I remember correctly, Barca went through on away goals last year, that is hardly what I would call a convincing victory, or a crumbling defeat. It was a close game, against the team that is regularly labelled the best of it's era