My wife has the HTC one, I have the older S2 like yourself... I've played around with the S3 extensively and from what I've heard the S4 isn't much of an improvement. I can say the HTC one has a good build quality and the aluminum gives it an overall feel of being a better quality device. The camera is fantastic as well, she is a professional photographer and she was impressed by it's ability to take pictures in low light (for a phone).
All in all I'd say it's a worthy upgrade but as someone who is still using an S2 I don't see any glaring holes in my own device that would have me rushing out to get the latest greatest.
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