Arguably the best on the market, Canon EF (Electronic Focusing) lenses have evolved to a level of near perfection. Optimal and exact construction of synthetic fluorite combined with scientific precision has made EF lenses a near flawless option. Take a look into the construction of these ingenious products through the eyes of Canon's dedicated team of technicians.
For nearly 30 years, Canon has made significant strides in their EF lenses. It is incredible to see the progression that optics has made over the years to improve imagery, reduce unwanted flares, and cut down on weight. From actuation to optics, and the elements that make up the aspherical glass, the level of research and engineering that go into lenses definitely warrants the daunting price tag. Far too often, and rightfully so, we find ourselves focusing on the principles of photography rather than the science within the lens. This informative advertorial video explains Canon's pursuit for the "perfect lens" through engineering, research, and development.
Originally introduced in 1987, Canon EF became the standard mount for Canon DSLR cameras. This setup operated on a "leverless and plungerless" electronic communication between camera and lens, thus making the lens an intelligently operating article of hardware that would come to revolutionize Canon photography. Including the EF-S and Cinema series, Canon claimed to have created its 100 millionth EF lens last April The milestone was achieved with the EF 200-400mm f/4L IS USM Extender 1.4X, which is also featured in this informative video.
The reason I am not moving away from Canon. Just waiting for canon to catch up with improved low light and dynamic range on it's sensors.
You are maybe right, though its tricky for two reasons:
1) It is hard to test the Canon lenses on other bodies, since it is designed to be on Canon.
2) Canon Sensors like you said lack of dynamic range mainly in comparison with Sony and Nikon even before they shift to use Sony sensors.
But what i love about canon is the accurate WB and the 1DX in general. In the ends, i don't trust ads for any company, i trust it after using it for a period of time :) and i'm loyal to what takes a better picture for the mean time.
Rumor says that if canon got a better sensors it will show the weakness of the Canon lenses but will see when time comes. Anyway I may not be able to afford the price of new camera body, I might be stuck to my 60d for the mean time and maybe just go to 6d when budget permits. I already got my 70-200 f2.8 IS II which I believe will be sticky around with me for a long time.