I've ordered the 6P. The 5X is practically the same phone as the 5 except for the wireless charging so there isn't a reason to buy it unless your 5 is sick. My 5 is sick, the wireless charging on my 5 doesn't work anymore and the speaker volume has become very low (I think the cause for the speaker volume is M not hardware, if it were hardware the speakers wouldn't work at all). The battery life is also poor and it's not possible to buy a new battery, I tried last summer, bought one from Amazon, it was significantly worse than my old battery. So for me it's new phone time.
When I buy a new phone I want an upgrade not just a replacement and the 5X has no significant improvements over the 5. The processor is less than 10% faster, the screen is the same, the storage is the same and the RAM is the same. It doesn't have QI (neither does the 6P) so that's a step back. The only thing that's better is the camera, but I have no complaints about the 5's camera, I think it takes great pictures. The 6P has a bigger higher def screen and the processor is 40% faster than the 5's, it has 3G of RAM instead of 2G and it's available with more FLASH (I ordered the 64G version although truth be told I've never had a problem with the 32G on the 5). I'm worried that it might be unwieldy but I figure that I'll adapt to it. The important thing is that I can pretend that it's a real upgrade.