So, getting this guy home last night, and yeah, while he certainly may feel like a smaller figure, the pics that have been out there don't lie. He is definitely Masterverse scale.
Towers over Marvel Legends, and most 6 to 6 and 1/2 inch lines--but put him side by side with a Revelation Man-At-Arms, for example, and he is the same.
The difference, however, is in the engineering. This figure is light-years great beyond anything Masterverse that it doesn't even seem like it's from the same company/property. They definitely won't mesh well together, imo.