some persons asked me to do RAWs of same picture taken with same settings by K-5, K-7 and K10 with overexposed sky to check possibility to take back highlight detailes from RAW.
i did it and you can try yoursef to process these RAWs.
here are files (PEFs):
K-5
http://files.mail.ru/758F7L
K-7
http://files.mail.ru/BEANOB
K10
http://files.mail.ru/1YFS0E
ISO100, f5.6, 1/10s, focus to infinity, sky overexposed by ~1EV
my view: potential of K-5 in taking back highlihgt detailes from RAWs is noticeably better than same of K10 and K-7