I have both. Princess is nice especially when you swap out the stock Russian/Chinese tube, it's a level above Sevelenta, JJ, it's a more 'hi-fi' 300b tube with a modern sound/presentation. I do recommend them over many similar priced 300b with the exception of Shuanguang black tressure or whatever it's call (because I have not own or seriously listen to a pair of those yet). The Royal Princess is yet another step up to the Sophia sound, more "hi-fi", more modern and more punchy and a bigger bottle and bigger sound. I think they output more and draw more, it does depends your amp/output transformer. Some folks like bigger sound, some don't.
Bigger is not equal to fat, bigger is bigger lips, bigger violin, bigger drum sound radiation. If you consider concert hall is your standard, than these Sophia are playing the entire orchester in a Jazz club and you are sitting at a couple tables from the stage, everything is big but not in a bad way, just preference. May be the other way to say this is it has less air or separation between instructment & people than some top notch Kondo 211 presentation.
BTW, some incredible people is trying to get $2500 for a pair of new Western Electric 300B, why would I even buy something new & seal in box ? Open & found cracked glass ?!
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Happy 2012 & cheers
Dominic