Apple's (NASDAQ:AAPL) smartwatch is still a relative newcomer to the wearable tech world, yet it's already asserted itself as the leader. Since its launch back in April, Canalys estimates that Apple's already sold 7 million devices.

That would put Apple Watch sales ahead of all of its competitors' sales combined, over the past five quarters. And it's not just Canalys that puts Apple in the lead. Shipment estimates from Strategy Analytics have Apple dominating the worldwide smartwatch market as well. Samsung, Pebble, and a few others are being left in Apple's wake, but with more smartwatches hitting the market, Apple will have plenty of competition in the near future. 

Click on the slideshow below to find out more about Apple's lead and how long the company might expect to keep it.