Just to support this problem report: I've tested the Canon 70D files provided by Max in a number of other converters (Photo Ninja, Capture One 7 Pro, ACDSee): the heavy "magenta highlights" problem ONLY appears in Lightroom, and it's a pretty bad example of the problem.
Just by way of summarising the content of the link referred to above:
Primarily in clipped highlight areas - 255/255/255 - Lr's usually excellent highlight recovery is generating SIGNIFICANT false colour, even at relatively low settings.
This happens with the Adobe Standard profile and with the "Canon Style" profiles.
It's an Lr-specific problem (it's not the Raw file); and it's NOT just a minor occurrence of the issue - some files will be unusable in Lr pending a fix.
See attached example - ONLY adjustments are white balance (which makes no difference to the problem) and highlight recovery.
I have the same problem and it drives me crazy. I get pink highlights when i try to recover overexposed(clipped) highlights. And even when they are not clipped, if I bring down exposure and highlight far enought, the highlight get pink hue. The camera that I have is canon 70D too. Previously I had nikon D7100 and hever had this problem even if the photo was really overexposed. So I figured that if I do exposure bracketing shots and then convert to HDR it would fix my problem. So I selected my 3 shots in lightroom(5.2), and then right click > edit in > merge to HDR Pro in photoshop. Then I selected 32bit mode and saved it. It saves TIF image into my Lightroom catalog but the result is awful, hightlight are pink and basicly no matter what I do, the HDR image doesn't look any better. It means there is also a problem with HDR Pro plug in in photoshopCS6. Below is HDR photo, regular photos donr look any different
Yes, I realized that the problem is not the camara, its the lightroom's problem with that specific camera. And it looks like the problem has to be popular/common for them to do something about it. So who knows when they wil fix it.
What I discovered is that both of the 70D CR2 raw files downloaded with this issue have one or two G /G2 pixels at a much higher level than ALL of the other R G B G2 pixels. I checked Canon 300D, 600D, and 5D MKII images with significant clipping and the R G B G2 levels were within 1 least-significant digit count. (14736, 14737), which amounts to a difference of only 0.007%. Both of the Canon 70D CR2 files had one or two G/G2 pixels at levels >7.0% higher. LR appears to be using these "single pixels" to set the G/G2 highlight clipping level used by the Highlights recovery control.
Even RawDigger gets confused when setting the highlight clipping levels for the G/G2 channels for these two 70D CR2 files. The fix will probably require a new Process Version (PV2015?) or a firmware update from Canon to limit the G/G2 levels so they match the R and B channels maximum level.
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