Last year I had my 5D3, 24-70, 70-200f4 and a borrowed 17-40mm plus my G12. I used the G12 most of the time. It was hot and humid or pouring rain (typical Paris summer), climbing up and down ancient narrow stairs and standing in line, no fun with heavy gear.
Pickpockets are EVERYWHERE in Paris, they even shut down the Louvre for a day because of them. The Louvre is gigantic and full of hundreds if not thousands of people. Including pickpockets. On the Eiffel Tower they had public announcements over speakers warning about pickpockets. It's sad, but to be expected where people are full of money and gear and distracted on every corner.
If you bring a camera bag, get one that opens from the back only, so nobody can get at your gear. Do not leave it out of sight for a second. Watch your phone as if you had $300 cash in your hand. My friend (who lives in Paris for the last 2+ years) had her iphone stolen. Watch out for people with clipboards asking you to sign some charity crap, people telling you they just found this wonderful gold ring, etc. No reason to be paranoid, but don't carry your wallet in your back pocket either. They can and do open bags (my friend has that on photos!), the subway is full of them. Often pretty and well dressed teenage girls from Rumania. But they come in all shapes and colors. Last year they called it the capital of pickpockets.
Also at least some places don't let you in with a backpack, so have something small you can (and want to) leave in a locker. If/when I go again, I'll leave my DSLR at home and will either get a mirrorless and sell it after the trip or a high quality P&S that records RAW.
I did not use the 17-40 much at all, too much distortion of buildings for my taste. 24-70 was perfect most of the time. I hardly used the 70-200, if at all. I brought it since we later went to Germany to visit my family there.
Unless you go on a dedicated photo vacation, I'd pack light and enjoy the scenery, instead of shlepping and watching gear. It's a fantastic town, sit in a cafe and watch people, sit at the Seine and do the same. Walk, eat and enjoy.
Oh, do not ever carry your passport with you, not required to have ID on you and a stolen passport is a major PITA. Supposedly the US embassy has a sort of vending machine to pay for the replacement fees, since so many are stolen every year. And the embassy is closed on weekends, read of people having theirs stolen on Fri evening before a Sat flight they could not take then. And cameras stolen with all the memory cards. That's the part that hurts, could not care less about the gear, it's insured. Something you might also look into for at least the trip.
Try to get away from the touristy stuff a bit, book lunch at the cafe on the Eiffel tower online now, gives you lift access to a seperate elevator so you don't have to stand in endless lines. Food is pretty good, views are fantastic. Book the earliest you can so you get a table at the window. Bring a small umbrella. Buy a museum pass if you want to go in a couple, also extra entrances and saves a bit money. Louvre is the size of a small town it seems, plan what you want to see, Mona Lisa is a madhouse and you can't really see her.
I could move to Paris tonight and live there for ever, that city has something magical.
But if I'd go only for a couple of days (and get over my jetlag there) I'd leave all this stuff at home and only take my Sony RX100II or something similar small and street efficient. Or buy/rent a mirrorless combo. I'd really want to just hang back and soak it all in, food, drink, people, smells.