Only 15 cars took the start!
Ignoring the fiasco at indianapolis '05, it's been a long, long time since fewer than 15 cars took the start.
1982 San Marino GP had 14, due to many British teams skipping the event out of protest.
I think the 1969 French Grand Prix had only 13 starters, of which Ferrari skipped...But not out of protest, but because they were going through one of their weak spells. There's a couple events from the early-1950s with small grids and just three constructors (including privateers).
History is mostly made of stats and many times it is said, about current events, that in the future it will all be meaningless because the numbers will all that will remain. However, Grand Prix racing has by now lived long enough for us to know that sometimes history recalls more than numbers. Some drivers have become legends even with little success. Some - more successful - drivers are only remembered when people recall stats.
So, Vettel's similar number of victories puts him (rightfully) in all the stats pages next to Hamilton and Senna. But, and this is my opinion and if you agree or not is irrelevant, Hamilton's record can be compared to Senna's. Vettel's record can't.
I think it depends on whether people regard Mark Webber as a great driver or not; if he's great, then Vettel
had a lot of explaining to do when he lost, or
had a weak teammate when he won...talk about painting the fellow into the corner!*
I think history and time is going to view Webber like a Rubens Barrichello, or going further back...like Gerhard Berger, Clay Reggazzoni, or Patrick Depailler; the likable number two driver who didn't offend but not the image of "the sore loser".
Maybe not quite like Ronnie Peterson, Jacky Ickx, Stirling Moss, Jean Alesi, or Gilles Villeneuve; trying to fend for championships on their own, having that spark or skill which made them fearsome on the track...but not quite arriving at the championship. There's the chance that a stirring sports-car career could vault Webber into that category, in my opinion; Ickx had a bit of a
"I don't really want to be here"-ending to his F1 career, but was a sports-prototype ace against a lot of then-current F1 drivers.
I think I'm starting to make an F1 Tropes out this, but I like to judge** each on their own merits and take in stats later on, in a bit of a 60/40 share.
* Or on the straight, like the 2010 Turkish GP.
** Not the Biblical judging thing, just a sort of fun F1 reverie.