If Vettel was to dominate for the next 5 years in the way he has this season some people would be saying he had no completion too, but the simple fact is he dominated them and the season.
Its just how you chose to see it.
How can you say Vettel had no competition in 2010 and 2011 when almost everyone on the planet were listing Alonso and Hamilton as All Time Greats in the making - and that didn't include Button, another WDC!?
I don't know if you know this but after Senna was killed, there were no World Champions left on the grid. Schumacher was competing against what were Williams test drivers (Hill, Coulthard) and Williams Indycar hires (JV, Zanardi), none of whom were being regarded by Sir Frank and Patrick Head as true Aces. That's why they hired Frentzen who - as they found out - wasn't very good either.
Think about that!
The level of competition Vettel faced in 2010 and 2011 was enormous in comparision to what Schumacher faced in 1994 and 1995.
It isn't even close.
Another huge difference is that the FIA favoured Ferrari significantly during the Schumacher era. Max Mosley will tell you if you have any doubt whatsoever. So, when the governing body is conspiring to give you an advantage, the competition is going to have a much tougher time being "the competition".