Alex Quitiquitwrote a review of La Sportiva G5 Mountaineering Boot - Men's on November 24, 2017
Familiarity: I've used it several times
Fit: True to size
These are the last pair of mountaineering boots i will ever wear (well, until they make a new version of this) - super light, agile, extremely warm, and great for every application from ice climbing to casual ridge walking.
They are essentially the same weight as the Phantom Tech but seem to climb a bit more natural, and fit my feet a bit better.
An easy decision for any mountaineering, especially if you think you'll be climbing in colder temps.