between these 2 pianos, it will be best that you bring someone who can play and you judge for yourself. both are diff designed instruments thus they will have it's own tone characteristic. although both of these piano, imo, have bright tone, kawai will be a little bit mellow than the yamaha. touch wise, imo, kawai will b a little heavier. since tone and touch are very subjective, the final decision - personal preference. do not worry both are well established brand in the market and the best companies coming out from japan.
kx 21, as i know this model should be a discounted model. kx series is oem by hsinghai beijing. and in the past kawai does have some little ups and downs working with them in production issues, since kawai have no full control of this factory. now, kawai have a new factory in indonesia, in 2005 kawai closed its north carolina factory, i believe there will be a new model replacing the kx - mid-entry level models. on the other hand, there is still kawai made in china by parson. however this model solely sold in china only.
in the us, yes u1 and k3 are both better models in their portfolio. while kx and k series are from kawai, they are two diff pianos altogether, in terms of designed and materials. k series have millennium iii action, better soundboard material, and etc.
u1 is the popular model of the yamaha. u1j is made in indonesia and share the same scale design as the u1 (japan). yamaha been making pianos in indonesia for more than 20 years and adherse to the same qualtiy standard as its japanese plant. however, imo, there is big diff between the u1j and u1 in quality sound. imo, largerly due to materials diff between the indonesia and japan and workmanship...
on the other hand, other than these 2 marques, there are other choices and yet affordable in the market today. but if you have done your homework and ended up with this 2 fav. pianos, then the best bet would be to choose the one that sings to you well. u wont go wrong with either one of these makers.
otherwise, check out some other brands too likes (in no order), Ed. Seiler, Hailun, Irmler, Ritmuller (Premium), Weinbach, Wagner, Challen, C. Steinbert, Young Chang, Weber, Samick, Pearl River.
or you can check this link out for reference.
Performance and Intermediate Graded Pianos
http://www.pianobuyer.com/spring13/44.htmlConsumer Graded Pianos:
http://www.pianobuyer.com/spring13/45.htmlThis post has been edited by jhp: Mar 25 2013, 04:52 PM