Are High Z SNe Brighter than LCMD Predicts?

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RCopernicus
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I've read one or two articles that are a little dated (2009) and having some trouble finding a thread that discussed the matter briefly. I know that SN US02Wil is bright (for its distance). Is anyone aware of any studies that show that SNe with a high Z appear to be brighter than LCDM predicts?
 
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No.

There are some rare events that look way too bright, but there's no systematic tendency. The vast majority of supernovae fall in line with the expected redshift-brightness relationship, and those few that don't can generally be explained as not actually being SN-1A events, or as due to chance alignments.