Coming from an S3 to the Note 2, I liked my S3, but it doesn't compare to the Note 2 phone size and having the s pen. I'm waiting for the Note 4, but from the early things I'm reading, I'm hoping they stay away from that 3 sided flexible screen. I think it doesn't make the phone look good and I see no reason for having the screen on the side other than for another couple of places for the screen to break or crack. Can't even see how a case would work on that.
I've been hooked on the Note devices since I got my original 10.1 when it came out. No phone is ever going to compare to what I can do on a Note phone with the features and stylus. Just my personal preference now. I'm sure the S5 is a nice phone though.