Hello.
www.500px.com/Vgramatikov
This is a joke or what?
Canon is not two generations behind Nikon and i will explain why.
Lets start with the main advantage for Canon.
- Lenses
Canon have mostly better and more lens in their EF line than Nikon in their FX line.
Just compare some of them:
16-35/4 IS, 24-70/4 IS, 24-105/4 IS, 70-200 4L,70-200 4L IS, 70-200 2.8L, 70-200 2.8 L IS II
35/2 IS, 35 1.4 ,35/2
50 1.4 USM, 85 1.8 USM, 100 2.0 USM
135/2 USM
100 2.8 USM, 100 2.8 L USM IS
i don`t want to speak of IS mk1 and IS mk2 super telephoto lenses.

))
Seems here Nikon is still have a lot more work to do to compete with this much of them better, cheaper lenses and all this you can find eazy second hand for good price!
Lets speak for other features and history of lenses.
Canon have their own USM designs of many lens way way before Nikon.
Some of them even are not available for Nikon like 100/2 USM and 135/2 USM.
Canon unveiled STM lenses for video and smoother af. Where is the Nikon here??? They just unveiled their AF-s versions of many lenses before 2-3 years. And much of them are much worse than than canon optics.
Just compare old 24-105/4 L with Nikon 24-120/4 AF-s ...fatal error.
Enough for lenses.
Lets check the cameras.
I will skip the entry levels DSLR`s
We all know that 7d is already better camera than old but good d300s. ( i was owned both)
60d was more balanced than d5100 and 7d was better camera than d7000.
Yes Nikon have now d7100 with 6fps and 6 RAW buffer... one big joke on the field.
Do let finish with the crop sensor cameras because 7d ii is coming. (and 7d is still better from d7100)
I have 70d now because my 7d was dropped in the water.
lets check the FF cameras.
For the entry d610 is somehow better overall than 6d. But in practice ( i have 6d) they are not much different.
But here may be point for Nikon for better value. But they messed up a lot with dust/oil sports with d600.
The major improvement in Nikon is d800/E, d810 cameras. Here canon can not compete like value and performance.
Nikon now will announce d750. Like a answer for 3 years old 5d3.
And the end i will say that d4s was introduced because 1dx was better than d4.
Let`s speak about technology.
Nikon have better Sony sensors than Canon for sure. But better for me usually means better for 100-800 iso and DR department. Nothing really more but still very important for some photographers.
Canon have unique Dual Pixel AF in live view. I own 70d and this working great!
With the STM lens combination is really a unique advantage for may types of photography.
I can use mu 70d almost like mirrorless camera for slow moving subjects, when i`m shooting stock and so one.
Nikon are behind with video capabilities and wi-fi interpretations. Their model usually get the wi-fi one generation behind Canon.
So...with one word. Nikon have d800/d810 but Canon just make everything other usually better and much earlier.
So the main disadvantage for Canon is sensor tech. But still there are not big difference when we are on the field.