Well the time has changed, now I can confidently say that I know much more about Paris than yourself.
Now I can easily drive from London to Paris without the need of navigation system (275 miles), I know the central Paris just like London since I have spent a lot of time in Paris since last year. I even know the surrounding areas of Paris and lived in 4 star hotel, 3 star hotel, 1 star hotel, private flat with my friends and also with family. Ask about any museum that I haven't seen, ask about any attraction that I haven't visited, ask about any shopping center that I haven't been or ask about any famous Road that I haven't walked at.
My current analysis says London is still better than Paris =)) But there are so many things in which Paris is ahead. So it depends upon your circumstances and the type of life you chose to live.