So it's hard to find tech-specs, but iSight was branding between 2005 and 2010. The branding changed in 2011 and forward to "FaceTime HD." At that time resolution did get bumped up to 720p, but since a camera's quality can depend on many other things like lens and sensor noise I hate to say for sure but I'm pretty sure 2011 and 2019 laptops all have the same camera. After getting a newer gen MacBook Pro and being instantly disappointed I went back to my 2011 and saw very similar performance and image quality.

In 2017 they did start shipping a 1080p camera on iMac Pros, but that hasn't made it to portables.

https://en.wikipedia.org/wiki/ISight#Built-in_iSight