I went with the only new lens on the list I've used, that being the RF 50 with the EOS R, and yeah it's amazing. Tack sharp wide open at 1.2 and has so far handled anything I've thrown at it. For me personally, the best performing lens I've ever used.
I'm not disappointed of the "R". I consider it a very good camera but I'm not planning to buy one because it doesn't fit my needs.
Since all hints of what "Pro" MILC from Canon released in 2019 will be points towards 5DSR replacement, there will be no RF mount camera for me at least till 2020 and even after it is released, I'm not an early adopter and usually wait about an year before buying a new camera. That means all Canon RF offering right now have same value like Nikkor or Sony lenses. I can't use them. So no, those RF lenses can't be my favorite no matter how awesome they are.
28-70 F2 definitely, when Canon will come up with a serious R camera (with joystick again, please, not this annoying slide bar).
For birding, I am more and more intrigued by every new generation of Canon's 600m F/4 lenses. They are so light now that I seriously consider an upgrade of my 500 mm lens. The first EF generation of this lens was by far too heavy to transport it far in rugged terrain, but the newer generations are really close to perfect. I still hesitate because I still hope an even more compact and lighter DO version to hit the market. I am pretty sure that Canon's technology, including the required manufacturing precision, is mature enough for bringing out such a great lens.
You buy a zoom lens for convenience, and trade that for the better quality you would have got from the primes..... except for that lens, where you get the convenience and it is better/faster than the primes it replaces!
My vote: EF-M 32 f/1.4 - it does a great job at an affordable price. And it turns the little M6 camera into a decent portable portrait and low light machine.
I'll probably buy the M5 mkII or the M50 Mk II when they come out just because of this lens. Bonus is that it is a great partner to the 11-22 IS and 22 f/2
To be fair, there should be "None" option to show that none of the released lenses is something we could use or want to buy which is exactly the case for me considering that RF will not be useful for me for very long time, big whites are not something I would even consider (especially shiny new ones) and those new 70-200 simply don't bring anything new to owners of excellent 2.8 IS Mk. II.
But... that's not the point of the poll. It's just to see what people think was the best lens released this year. Not what out buying intentions are, or whether we're satisfied with their design choices or whatever.
I doubt I'll buy any of these lenses but I can pick my favourite nonetheless