Kawai CA7 vs CA13

[LisaJD]

Hello!
I have found both of these digital pianos for sale second hand for the same price, and can't work out which is the better to go for.
I know the CA13 is very new, whereas the CA7 is at least 6 years old, or more. The CA13 was bought for £1400 and the CA7 for £2000, which would suggest that the CA7 is a more expensive piano, but the price difference could just be because pianos have become less expensive in recent years... Also the CA13 has 'RM3 grand action", a new key action that is supposedly better than what the CA7 has. The specs of both pianos are here:

CA13:
http://www.kawai.de/ca13_en.htm

CA7:
http://www.kawai.de/ca7_en.htm

Thank you in advance! :)