With the Xperia Z3v turning out to be yet another band-crippled device when it comes to LTE, I'll likely pass. Bands 2, 3, 4, 7 and 13 do not light the fire; they basically cover Verizon's plans for the next two years (2, 4 and 13), plus high-frequency-only for T-Mobile (2 and 4) and for VZ's European roaming partners (3 and 7).
When a phone comes along with 13 and 17 in the same device, and therefore easy switching between Verizon and AT&T, we'll talk. I can't quite believe that it's now more than a year since Apple laid down the gauntlet in this respect with the iPhone 5s, followed by every cellular iDevice since, and we've still to see a single Android phone in the US with these two bands in combination.
I'd go for Sony's D6603 model of the Z3, hopefully close to US launch, which has both 13 and 17 and a lot else besides, but no CDMA -- but Verizon still apparently is not ready to start activating VoLTE phones without CDMA.