Hmm.
Kalista's vision is not similar to Quinn. They are quite different so they probably shouldn't be compared.
The Sentinel doesn't give instant vision in a way that Quinn can.
Heightened Senses has no wind-up and no cast time.
Sentinel has a noticeable wind-up/cast time.
Heightened Senses doesn't scout as well as Sentinels though.
As you can see very different.
Ashe's Hawkshot is pretty much both Heightened Senses and Sentinels merged into one.
If Ashe had some form of dash or mobility she'd beat them both pretty easily. She'd also be OP.
Aside from that, I think Quinn would be buffed pretty well if her W became ammo based, because during the first few minutes of lane phase you don't really use W at all or very often. So you'd have a really long vision coverage if you stack the duration on top of each other once you start engaging or having longer fights.
This might be something that would bring Quinn more into the spotlight but it doesn't address her bugs and unreliability with Passive and general... bugs.