For the time being, though, I'm going to wait out the "my phone is bigger than your dick" game that everyone and their dog seems to be engaged in. 175 grams is way too heavy to carry around in a pocket, let alone hold with one hand for more than a few minutes. And yet everyone competes in the already overcrowded "flagship" market instead of trying to find a niche.
I hope at least some manufactorers will return to their senses before my 4.27-inch, 107-gram Galaxy S4 Mini begins to feel unbearably slow.
The Nexus 5 is bigger and heavier than that, but I'm keeping it near the edge of my radar in case I have no other choice.
<rant> LG recently began to market the Gram, a series of high-end ultrabooks that weigh less than 1000 grams. Why on Earth is nobody trying to market medium-to-high-end phones that weigh less than 100 grams? </rant>
As for the software, I don't really care as long as I can wipe it and replace it with Cyanogenmod. Just checked and it seems that Cyanogenmod supports the Z3 Compact. Thanks for the suggestion.