Hi Dragoon2745,
I'm using both the Pro Display XDR and LG Ultrafine 5K monitor. I use the monitors for photoshop, lightroom, FCP and casual web browsing.
In my day to day use, they look very similar in terms of display -- I'd give the XDR more points for:
Better color representation and contrast (the LG tends to oversaturate a bit compared to the XDR. Profiling the LG helps - I have an i1 for that).
Text on the XDR looks a bit darker and more crisp (due to better black levels).
Regarding HDR on the web/browsing, I use Chrome to view HDR images / pictures. Safari is lagging in that area.
I don't think the LG looks washed out compared to the XDR - however, I would say that is a matter of perception and preference regarding "how they look side by side / in terms of displaying content" -- I'm very happy with using both displays.
You might check out Greg Benz's web site on HDR for some insights and explanations on HDR in photography and the web. I've provided a link below:
B&H is currently offering an outstanding deal: $200 off the brand new ASUS PA32UCXR monitor, which is a stunning 1600 nits monitor with 2304 local dimming zones (4x the Pro Display XDR), automated calibration, and single cable charging/pass-through. I recently bought one of these to test and...
gregbenzphotography.com
The examples on Greg Benz's site look much better on my XDR vs my LG via Chrome. In Safari, the difference is much less noticeable on both the XDR and LG.