I do think for most the Baruntse is a better boot than the Spantik...certainly a more rigid sole and a soft flexing upper. Having climbed a fair bit in both I prefer the fit and climbing prowess of th Baruntse. Barunse also fits me much much better than the Spantik, the majority of that because of the easily heat formed inner. They climb hard technical ground extremely well. I hurt a foot this summer so had to bump my boots a 1/2 size. For me at least I wear the same size in the majority of the La Sportiva boots. Trango, Nepal, Spantik and a Baruntse in a 45...until recently.
These boots how ever have been -SOLD-! Thanks!