Hey, don't get me wrong, I love the phone and I have taken some pretty good shots with it. But to this day, my experiences with the S4 and the Note 3 have been the same: Slow Shutter. It is improved in the Note 4, but it's not gone.
The iPhone camera, however, doesn't have this issue (I currently have an iPhone 5s for work, but I've seen the reports from actual camera data from iPhone 6/6+ and the shutter speed IS fast without the need for burst mode). Sure, at the race track most phones will get blurr, but if you're taking pictures of running kids or moving puppies (which was my case), you're more likely to get a blurry shot out of the Note 4 than with a newer iPhone.