Those differences seem enormous.

SRAM bitcell, High-Density (HD)

    A Intel 14nm: 0.064  µm²
    B Intel 10nm: 0.0312 µm² 
    C TSMC  7nm:  0.027  µm²

A is what most current intel chips use, B is in limited production. C is what AMD will be using in 2019

Is B even in production at all?

AFAIK there's a single 10nm Intel processor available – the Core i3-8121U. Performance is sub-14nm though.