Feedback is now coming in from Pro owners about the Q3.
As suspected for PC VR there's really not a lot in it. The biggest difference in PCVR with both the Pro and Q3 are the pancake lenses which are very similar.
Q3 has better encoding and WiFi performance but if you already good performance on Pro (especially with a 6E router) then that's not a big difference.
Pro has better colours and contrast, especially with Local Dimming, while Q3 has a higher resolution but it's not so great it makes a massive difference. Just slightly reduced SDE.
Pro has eye tracking which can now be used to get better quality and performance in some PCVR games using the OpenXR toolkit. This is especially true for Sims like DCS.
Q3's passthrough is better but still grainy. It's nowhere near as good as we were led to believe. The depth sensor does make a huge difference for MR content though. (Thanks Meta for removing the Pro's sensor
)
Like all headsets Q3 comfort is a mixed bag with some people liking the default strap while others hate it. Though Q3 will have more different strap options. Pro can be uncomfortable and the options to fix this are more limited but a simple top strap works great.
The Q3 facial interface is again a mixed bag, with some liking it while others hate it. The Pro allows you to ditch the facial interface entirely which is really comfy, and I rarely use the light blockers. Plus Pro is more glasses friendly. Hopefully Q3 will get some Halo straps which mimic the Pro's design.
The Q3 controllers are surprisingly good, but possibly too lightweight and have way worse haptics than the Pro controllers. Tracking is obviously worse, but good enough in most circumstances. I was surprised they didn't include the Pro haptics as they are amazing, but I suppose they're too expensive.
Of course the Q3 smokes the Pro in standalone performance which is why I'll be getting one, and this is where it will see the biggest benefits with far better graphics and more complex games being possible on standalone.
So if your using the Pro mainly for PCVR there's not too much incentive to ditch it for Q3.
If you do a lot of standalone then Q3 is better but initially at least there won't be that many games updated, but that will change over time.
Me, I'm keeping my Pro for PCVR, but will replace my Q2 with a Q3 for standalone.