D800 -> D810
The 5dm3 is looking really old.
Although they're in the same general price range, one could argue that the D800/E and 5D3 weren't really competitors. 5D3 is a jack-of-all-trades camera. D800/E are more specialized. D810 and 5D3 on the other hand are competitors, in so far as the D810 is more of a jack-of-all-trades.
But let's assume that, because of the price point, the D800/E and 5D3 were competitors. They both came out in March of 2012; so they're the same generation. Chronologically, canon is one generation behind. However, in that market, I don't believe their goal is to churn out new bodies with high frequency (as opposed to the entry level market where they do). Rather, their goal in the pro/prosumer market is to release bodies which remain viable as long as they're designed to.