@ this sample gallery of a Japanese new K-5 user:-
http://photozou.jp/photo/top/300009
Full size samples are uploaded and now available for download. Lens used is the DA 18-55 WR Kit. Some selected samples of the same scene are as follows:
ISO 80: http://photozou.jp/photo/show/300009/53154387
ISO 100 Bright: http://photozou.jp/photo/show/300009/53154769
ISO 100 Natural: http://photozou.jp/photo/show/300009/53154339
ISO 100 Reversal: http://photozou.jp/photo/show/300009/53154362
And, all in 10M JPEG: ISO 100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600, 51200
Additional remarks can be found per picture page.