Anyone who has seen me post knows how much I love my HP2 by Roland and for the price(under 20000CDN) it is still tops in my book. However, the HP3 and HP4 are more expensive and really no better as far as sound and touch is concerned. You really are paying for the bells and whistles. The HP1 simple sucks on every level. They may have a better model, they have a baby Grand type, but that is 8 to 9000 CDN so we are talking about another machine at that point.
So for price the HP2 is still the best, but if you are willing to spend a little more, say a thousand more you can get the Yamaha Clavinova CLP 170 and it is simply amazing. A few seconds on the keyboard are I could tell the difference. It's not cheap to better different, but it really is good to better different and the price is really not that far off for the difference in quality.
It has a GH3 Graded hammer that is very different from the regular GH the CLP 150 or 130 and lesser models have that I found to be very very lacking.
The sound is a question of taste, but is really no better or worse than the Roland. The keys seemed grittier then the Roland and I liked that better, but it could be they were just dirty.
So there you go, I said it. Yamaha's Clavinova CLP 170 is better then the HP2. A little pricier, but if I had to do it over again, it would be a Yamaha and not a Roland sitting in my living area.