Waveform IRE Level Over 100 on Sony A77 but not for Canon T2i

Why does the Sony A77 have a white IRE level over 100 while the Canon T2i max out at 100? You can view this larger if you like so you can see the graph better, http://www.flickr.com/photos/davedugdale/6326846722/.
On my Canon I have highlight tone priority turned off and Auto lighting optimizer turned off as well. Also on both camera I have them set to a neutral picture style and the lowest contrast setting.
I am trying to do a test on which camera can hold the highlights better.
As you can see I matched the skin tone levels on the left by changing the camera settings to match each other so I could see what would happen on the right side where I drew a tree that is heavily back lite.
But it is hard to draw any conclusions when the Sony is "cheating" with higher IRE levels.
I wonder if it has to do with the color space? I don't think so because both are using the sRGB color space.
No transcoding was done to any of the clips dragged on to the timeline. Just "raw" files from the cameras.
The Sony A77 creates AVCHD Video (.MTS) files while the Canon T2i creates MOV video (.MOV) files.
What is interesting is if I use the same clips in Sony Vegas Pro 9, the Waveforms match at 110 IRE. Something wrong with Premiere?
Sony A77 on the left and Canon T2i on the right.
To see better: http://www.flickr.com/photos/davedugdale/6328037442/

Thanks everyone for replying, here is a some more info from the two video clips that might help (meta data):
This is from the Canon T2i:
Video:
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : [email protected]
Format settings, CABAC : No
Format settings, ReFrames : 1 frame
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 29s 654ms
Bit rate mode : Variable
Bit rate : 32.9 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Original height : 1 088 pixels
Display aspect ratio : 16:9
Original display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.661
Stream size : 116 MiB (96%)
Language : English
Encoded date : UTC 2011-11-08 13:05:09
Tagged date : UTC 2011-11-08 13:05:09
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.601-6 525, BT.1358 525, BT.1700 NTSC, SMPTE 170M
This is from the Sony A77:
Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : [email protected]
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Format settings, GOP : M=1, N=12
Codec ID : 27
Duration : 28s 987ms
Bit rate mode : Variable
Bit rate : 20.9 Mbps
Maximum bit rate : 22.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 23.976 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.420
Stream size : 72.1 MiB (95%)

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