Yes, the Panasonic 65PZ800 would have been several thousand Euro cheaper than the XS1. It took some persuasion on my part to get my wife to agree to the purchase of a television so much more expensive than the one we'd already been planning, which was dear enough in its own right.
Hopefully you'll get it and share with others your eyeballs report.
The XS1 is now hanging on my wall. It was mounted two days ago.
The model I have is the LC-65XS1E, the E denoting the European model.
That E turns out to be significant, as there are hardware differences between the European, North American and Asian models. Most of the differences are in the tuner box.
My European set, for example, has no Ethernet jack. Consequently, there's also no push-service offering weather and stock information, etc. via a stripped down browser.
There are only three HDMI ports on the European model, too. One of these is located on the front of the tuner box, which requires opening the front panel, allowing dust to gather. I think I saw in the PDF of the US model's user manual that there are many more HDMI ports on the North American model.
On the other hand, the European model has inputs for a satellite dish, which the US one doesn't. Maybe there's even a basic DVB-S tuner included; I haven't checked, as I don't have satellite.
The shop that installed my XS1 performed professional calibration as part of their installation service. In its factory state, the XS1's colour was turned up way too high.
I watched Close Encounters of the Third Kind on Blu-Ray yesterday evening (using a Sony BDP-S550) and was stunned by the PQ, particularly the black, which truly was pitch black; as if the set was turned off. PQ in general is stunning, but as I've said before, I'm not a videophile, so I'm probably more easily stunned than many people here.
The TV is a little slow to start up when turned on and changing to a channel with a different resolution is much slower than I would have liked. Going to or from an HD channel with 1080i takes a few seconds. In the interim, the screen remains black. This could be the fault of my cable box, I suppose; I haven't looked into it.
Anyway, all in all, my first impressions are very good.