DNG is heavy at only 1856x2784px (canon SRAW2 setting 5dmk2)

But so is the CR2 file...  5DMK2
CR2 SRAW2 = 13.6mb 5.2mp (1856x2784)
DNG conversion = 15MB!! (no RAW file embedded)
These SRAW2 files are only 5.2mp.  My older 1Dmk2 which was 8mp was producing RAW photos half that size and the DNGs even less, not more.
I do believe this is a Canon twist due to the high files size of SRAW2 mode but should the DNGs be an extra 2 MB more than the SRAW2..?
Any ideas and explanations?

DNG does not support the native image format used by sRAW. Hence the conversion to DNG requires producing a three-channel demosaiced RGB image, which is much larger.
Eric

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