I do not share your optimism. GTA V is a much less demanding game, and your extrapolation may not hold water.
Your GTX 860M is about half of the minimum requirement for the game. Consoles are likely to outperform it handily, and you will find yourself limited to reduced resolution and settings.
If we get good reports from members running with GPUs such as the 650Ti and 750Ti, it may do about as well.
There are different versions of the 860M, one with an older Kepler gpu and one with a Maxwell gpu; they both perform similarly though. It's in fact not too far away from the PS4 GPU, but slower.
I have the Maxwell one, and if the two are different, it's how much better the Maxwell GPU can be overclocked without running into thermal limitations.
I wanted to do further research on this matter, and I've got some stuff:
First, the desktop equivalent of the GPU in the PS4 is the Radeon HD 7870, as seen in
this article.
Taking a look at the YouTube video below:
http://www.youtube.com/watch?v=_z3-LhimHBQ
The 860M appears to perform about 5-10 FPS better than the 7870, on average. Granted, on a newer, more demanding demanding title like The Witcher 3, the differences are minimal, but take into account that I've overclocked my GPU, and as a result can eke out another 10-15% performance boost.
Furthermore, my CPU (i7-4710MQ) greatly outperforms either console's, which use octa-core AMD Jaguar parts. From the same article above, the equivalent Intel CPU would be the Intel Bay Trail Atom, which is for netbooks.
And finally, there's this video:
https://youtu.be/JxUPJdcChzE
Taking all the above into account, if the PS4 can achieve (or at least, is supposed to achieve) 30 FPS @ 1080p, at what I assume are high-ish settings based on recent reviews, then from what I conclude, I should achieve ~40-45 FPS, easily.
But I'll wait and see.