I wouldn't say that they are the kings, they won it last year but that doesn't mean that they will win it this year neither. It’s going to be a tough job but I believe that they are going to end up with a good run, yet fail at somewhere along quarter finals or even maybe semi-finals.
PSG and City are fighting for the title very carefully, they really need it and in order to make all these spending count for something the league titles are not enough anymore, they need to win something in UCL to keep this up, otherwise it would not make any sense at all. I personally believe either City or PSG will win it and finally have the happy ending they wanted.
For now Real Madrid remains the king of the CL until the season ends and a new king emerges in which so many predictions are on Man City and PSG. I will still add Xavi boys to the list because Xavi too is bent on lifting this trophy and sending it to Camp Nou. For now City, PSG, Barca and Real Madrid have equal chances of doing the needful to the CL title and the best strategy wins the trophy until then Real Madrid remains the king of the CL