It doesnt really matter what sort of process tech lead intel has because they waste so many transistors on their horrble gpu which is about half as efficient as maxwell @ 28nm. If intel were to license maxwell and put that on their die then they would be able to put out an SoC that really highlights their process advantage. Intel is trying to brute force their way into a market that requires fps per watt, and they cannot compete there, even with their process advantage. IMG Wizard, nvidia Maxwell, even Adreno is more efficient. At the end of the day, a shrunken turd is still a turd. Intel graphics at 14nm will still be garbage. So what is the point in having the process advantage when in the end they are still so far behind? If intel were to release 10nm today, then maybe then they could compete with today's 28nm maxwell. That's how far behind they are...
Half as efficient? 14nm garbage? That are a lot of unfounded claims. Do you have any sources/proofs, or do you just base this on that Nvidia PR slide? We all know you mustn't trust PR slides that claims things about performance. I certainly wouldn't trust Nvidia's claims. Anyway, I could also
show you claims from an Intel architect who claims they're competitive; so the answer simply depends on who you ask.
Also, Gen7 is about 2 years old, and that was about the first real serious GPU architecture that isn't some hobby project, while Nvidia exists to make good GPUs; a 'slight difference'. You would expect them to have the superior architecture.
Secondly, you forget that Maxwell has to compete against Gen8, which has been hyped up for the last 2 year or so. So the gap in architecture is rapidly closing and I don't expect Maxwell to perform any better against Broadwell APU in terms of performance per watt.
Thirdly, what does it actually matter for consumers if they use their process advantage to become more competitive? From a technical point of view, you could make the case, but the worse architecture and the superior process node simply cancel out for consumers (so for Intel it doesn't matter if they don't have a top notch architecture).
Lastly, you claim that only the GPU matters, which obviously isn't the case. The CPU is just as important and there Intel has taken the lead at 22nm with Silvermont, while Nvidia has horrible A15s. They'll do the same at 14nm with graphics, which will really be Intel's first serious node for mobile (their 22nm parts have inappropriate BOM).