The Pro Apple press would have one think otherwise, as they've gone out of their way to pronounce some of the S4 features as "gimmicks" a word they would never associate with Apple for any reason, even if true. Personally I do find some of the new changes in the S4 a bit gimmicky and do not hesitate to say it. No different than how I feel about Siri.
There's an underlying current of Samsung hating / Apple loving dialog, in the various "reviews" that is so bias it's not funny.
Of great importance is for me to post my usual Disclaimer: "I am NOT advocating for either company". If you've read a reasonable number of my other posts, you know I use and enjoy both iOS and Android, each for their strengths and variety compared to the others. I happen to be very passionate and involved in Apple products, year after year for far longer than most that only came on board with the advent of the iPod, iPhone, then iPad.
That said, I always enjoy a good _discussion_... not to be confused with some of the vague and irrational bashing of Android or any other competitor that goes on here, out of nothing more than negative hatred.
If one is serious, they don't "burn" an upgrade for any phone. They _use_ their upgrade wisely. So if the OP is unsure, the best solution is to stay put, use what you have until Apple comes out with a new model. Otherwise it will be burning an upgrade, only to return on MacRumors to explain just how bad the phone you bought performed, even though you were biased against it from the beginning.
Nothing beats resisting an impulse purchase, doing some research, and thinking before you order. Then once you've taken delivery, spending some time and effort to learn how to use it appropriately, not just trying out the obvious functions.
If more took this approach, no matter what brand was chosen, there would be far fewer disappointed buyers.