jaomul. Yes, I have some Canon equipment, and 4 years with Canon. I have a lot more Nikon equipment... 1982 to 2011 with Nikon.
Now, your post has one obvious hypothetical, which is the assertion "that if the results are close", there's little incentive to make any change. Unfortunately, in my book, the Nikon kicks the Canon's a$$ where it counts the MOST. The Nikon has two and a half f/stops better a dynamic range score, which is without a doubt the most-advantageous metric to improve upon with any digital capture system. And two and one half f/stops is a HUGE improvement...the Canon is limping along with the best of the rest of its older generation of sensors and electronics, at 11.5 stops. The Nikon D7000, which is a full generation newer in both sensor and noise reduction/suppression technology, is reading a 13.9 f/stop dynamic range. A difference of two and four tenths better. Each f/stop involves a doubling over the one prior...two f/stops is eight times more light...so...
HIGH-ISO performance....those low-light situations like kids' birthday parties, BBQ's at dusk, indoor sports events... Nikon's score is 1167...Canon is at 813...once again, the Canon is getting its A$$ kicked under the difficult lighting situations, which, with consumer-speed lenses, means, well, the Canon is at yet another disadvantage. While on-line reviews that need to please advertisers might show the cameras with "close" performance, I do not consider the actual, cold, impartial capability measurements to be "close". Far from it, in fact. Especially on the two most-critical performance metrics: dynamic range, and High-ISO performance. Hey, ANY automobile is fine at 20 to 40 MPH in town...when you get to a difficult,twisty mountain road, an economy-level is Kia going to come up short against a Mercedes...
There *was* a time when Canon was the undisputed better performer in image sensor technology,and Canon people crowed about Canon's "lead" all over the photographic world. Well, that time has passed Canon by. The Sony/Nikon and Sony/Pentax consortium has focused on improving image sensor performance, while Canon has devoted its resources to trying to catch up to things like in-body flash command systems, and color-aware light metering...well over a decade behind Nikon.