I guess it's all about different tastes, I always hated the sound of the pinstripe heads on that kit, I think he was also triggering some of the studio recorded sounds from a Ludwig kit as well.
I listened closely to the 86 concert and the 82 Milton Keynes gig last night and compared the sound to the current kit. I have to say IMO the current kit has the nicest natural sound but the chrome 82 kit comes across the best in the mix. I think he used to have the heads a little tighter on the older kits and hence a brighter sound.
The current kits sounds wonderful in the solos but does get a little muddy in the mix when everyone is playing.
Then agaion he now has to compeat with two guitarists and major keyboards, not just Fred, so no wonder things get lost.
The Yamaha was a nice studio kit but for me it just wasn't Roger, the hardware was flimsy compard the the Ludwig and the sizes were standard, just didn't seem like Queen some how. And combine that with the fact most of the concert had sampled sounds backing up the natural kit always made me think it just wasn't up to trhe job.
"It is better to sit in silence and have people think you're a fool, then to open your mouth and remove all doubt"