I just realized that DNG.files are like 3x faster in develop mode to load than canon's own cr2.. Anyone else here who noticed that?I don't use LR4 yet (I am getting a system that will run it shortly) but I do use DNG because the 5D3 is not supported in LR3. That said, when using DNG it helps to use the conversion setting of 'Embed Fast Load Data'.
On paper DNG is supposed to be as good as RAW, but does it have "all" the information that a RAW has? Has anyone done tests on this?
Yes and No. It depends on which of the three versions of DNG you select. If you pick the one with the RAW files embeded, everything is there. Otherwise, some of the Canon unique tags may not be there. Lightroom doesn't use these anyway, so it makes no difference.
You can also open DPP and batch save the files to photoshop or wherever you want them. They will be converted to tiff files,which are more universally used than DNG. You will still lose the Canon specific tags.