I'm actually worried about upgrading in September! Most of the flagships will have been out for months barring the 6. However the massive Note4 is out soon and may be worth looking at.
The M8 is nice to hold though, nicer than I thought it would be. The Z2 is the coolest, slick and lovely shape, the S5 fell down due to plastic style finish (it sounds like they're moving away from plastic for the note 4 and possibly the S5 Prime) i'd still own an S5 but do I wanted a dated phone?
That Stuff website is fantastic though if you guys are looking for a proper look into some of the phones mentioned.
Why am I put off with the HTC
Tom? Convince me, I feel like i'm missing something in comparison to the nice Z2, maybe i'm basing it on looks.