I'm running 4.4.2 on the Canadian model as well, I747M. I just got an update about a week ago. This particular update seemed to improved the performance of my phone at least so far. What I have noticed is that in the past, when playing music over BT audio in my car, the music would occasionally cut out for a split second. It is usually OK for the first day after a reboot, but then happens progressively more often. After a few days, I haven't noticed this happening.
I'm going to have to give it a couple of weeks after a reboot before I'm convinced that the issue has gone away with this update. I had to reboot my phone yesterday as Google Play crashed after updating several apps. I generally don't turn off my phone or reboot it. If I need to turn it off, I put it into airplane mode instead.
The other issue I've had with previous updates is that I would have issues with getting a GPS lock from time to time. A reboot usually solves this issue as well. Again, it's fine after a reboot and generally starts happening after a couple of weeks. Again, I'll have to wait a month at least before I really feel confident that this issue has gone away.