Hello,
I recently purchased my iphone 5s because I ******* got robbed my moto x.
So, basically i NEED a phone cause i didn't have a backup but boy I love my iphone and I don't feel any remorse or whatsoever for not waiting for the 6. Tbh I rather be in the "S" cycle as it seems to have far less issues than the number series. iPhone 4 -antenna gate. iPhone 5, chipping/scuffed issues. Check the same issue on the "s" phones, almost none issues posted on forums. Nevertheless yes, i will miss my moto x 4.7 inch screen that will be included in the next iphone but still, I still find pretty useful the current 4 inch screen on my 5s. As many may have told you, buy only if you absolutely need a phone and not just for upgrading sake which then i'd wait.
Good luck!