Parineeti does not even come close to Vidya. Vidya is in her own league. I'd wager you can make a case stating that Vidya has carved her own place in the industry that refrains from playing on the traditional female 'damsel in distress' trope. As another poster pointed out, Vidya is "the actor" comparable to people like SRK, she gets meaty, lead centred roles. Plus they both are from basically the same generation.
Parineeti has a long way to go before she reaches Vidya's status. And I'll admit, I haven't seen Parineeti's films fully, but in the trailers (excluding htp) she plays the exact same outspoken, fearless character. It's not anything really now, quite stereotypical if anything.
And when it comes to acting, Parineeti is good. She isn't as 'omg amazing' as the critics like to say. But she hasn't shown range. I'd like her to do a serious, maybe indie film like Chameli, Choker Bali, Fashion, etc to show that she can really dive in and play complicated characters.
And in comparison to other, honestly, Alia does not even belong in the group. She's only one film old and she wasn't that great in that film. Highway hasn't been released. I think Parineeti is probably a better actor than Alia, from what we've seen, although that could change.
And Sonakshi and Parineeti are in different positions, which is why I'd also take caution when comparing them. Parineeti has the backing of YRF. Sonakshi does not. That makes a lot of difference.
4