Both the 5090 and KRP500 have plasma buzz, especially with no powersave modes engaged (the set uses max. power). You'll soon get used to it though. Even so, brightness levels are not great when, for example, showing snow, sky or any other bright content taking up large parts of the screen. This can result in whites not looking pure. This is just as important as good black levels. The buzzing reduces to negligable levels when engaging powersave modes but brightness drops even further so is not really an option. - Bear in mind that all plasmas will loose brightness over time, this may not be an issue in a year or two, depending on usage, but may well become more serious over the longer term if you plan to keep it.
I can only assume that because of the 'deep waffle' pixel structure viewing the set from an angle drastically reduces colour saturation and brightness, more so than on many lesser lcd's. Some higher-end philips/samsung/sony sets don't suffer to the same extend. Again, because of this structure, pictures can actually look slightly flat (as opposed to 3 dimensional) compared to the best lcd's and even mid-range panasonic plasmas (though they lack in other areas imo).
The screen has an outside coating that is nigh on impossible to clean other than with the enclosed micro fibre cloth. You have to be careful not to rub the coating away and never use any liquid on it. I have read this results in smearing that is even more impossible to get rid of. Luckily I never had to do that and only used a feather duster. This coating (perhaps another one inside) has also the effect of showing what looks like dirty streaks on bright scenes, especially when scenes are moving though they are there on stills too. These streaks are always in the same spot and probably the result of the coating not having been applied evenly. This will be different for individual sets but has been mentioned numerous times on owner forums for both the lx and KRP models and can become rather irritating as it takes a lot of clarity away from bright pictures.
Colours are ok but again, I'd go as far and say the likes of philips, high-end panasonics and perhaps Samsung do it just as well if not better in some cases. I did'nt include Sony's as I think the Bravia 2's are not particularely leading in that respect and the Bravia Pro X series, though excellent, is more expensive than the similarely sized Kuro's. Can't comment on the later Bravia 3 models.
If this all sounds damning, these sets are still very very good. But when spending over 2k on a telly (more in your case) you will be more critical and any flaws will be magnified.
I never had my 5090 ISF calibrated. The thought of spending another £300 on it quite frankly was not an option for me. Especially as my dealers KRP did'nt look much different and had the same issues I've mentioned.
It's probably still one of the best tv's but I believe you can now come very close (and improve in certain areas) for a lot less money. At 60" your choices are naturally more limited (and the KRP600 may not have some of these traits) but perhaps consider to look at my previous suggestion before committing. Of course you may not find any of the points mentioned a problem and love the set which I hope will be the case.
Hope this helps.
As always, my opinion only.
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