It's weird, I have the G3 which the girlfriend has the S5, the screen size is different between the two but the overall size of the device is the same, it's weird and it's annoying that some manufacturers keep this huge bezel for seemingly no reason (HTC being the exception due to speakers).
I've owned the HTC One M7 for a few months and I did like it, but found it was too narrow for how tall it was, but the build quality and the screen was awesome. I quickly got rid of Sense, though, and installed an AOSP ROM and stuck with that. Never really got around to the bells and whistles of Sense or Touchwiz. The Google UI along with the G3's UI are damn near perfect, with Google taking the cake.
Regarding the resolution, most people won't be able to tell the difference between 4k and 1080p, especially if the devices are the same size (S5 and G3 I see no differences despite the .3" difference). But I guess since I look at the specs more so than an average user, I see 420dpi as opposed to 445dpi both on displays running at 1080p. Yea, I probably won't know the difference, but it's all in the numbers and in this area, bigger is better in every sense of the phrase.
I hope Google will get their shit together with the new Nexus and have Motorola implement and external SD, or 32/64gb variants and leave it at that. I don't care about the removable battery or what not, just give me something where I can up the storage if I so choose.
To me, even after a year, the Nexus 5 is the best device I've owned and that has been released. I still mess around with it but don't use it as a daily driver, but seeing Android L running on there it makes me miss using it from day to day.
Yeah, the S5 in my opinion is just...weird. The screen/size just are not comfortable I think. I think HTC hits it out of the park, I prefer the narrow design by far.
I guess I never cared enough to go through the trouble of new ROM's so I just picked up Sense and I love how it handles. Knowing I'm using the outdated version gets me excited as well to see the upgrades.
It makes sense that you're looking at the numbers and knowing where they stand, the differences will be more apparent for sure. Unless the resolution is shit, I don't notice. Bigger is better. M8 is 1080, mini 2 is 720...definitely a factor though not a big one.
No external is a deal breaker for me. I throw all my music on my phone and shit, so I need that space. I would've gone M7 maybe if it had external.
Never looked much into the Nexus, not a fan of the style of the phones so I just overlook them at that point.