I don't think there exist one device with completely no glare. But it's definitly got less glare then the 600. Also the screen is way more clear then the 600. I also own a 600 and I was suprised at how unclear and blurry my 600 screen is compared to the 650.
That was one of the big reasons in fact to upgrade from the 600 because I already saw on some youtube videos that this screen was much more clear and had more contrast.
I would suggest you look up some youtube videos to make up your mind. That's what I always do when I am considering a device and want to know more about it.