Today I tried a new workflow published by Kinematic Digit on Flickr and it works really well. Here is my comparison:
01_JPG.tif - OOC jpeg
02_RAF_KD.tif - raw file converted using KD's method
03_RAF_LR.tif - raw file converted with LR standard settings
04_RAF_SP.tif - raw file converted with Silkypix
Results are very good but I still can't still justify an extra work.