Commit-ish shortcut for immediate parent range

Hello,

Git's commit-ish is very powerful.  I was wondering however, if there was a 
shortcut for (for example)?

 git-diff 3435fdb4c^..3435fdb4c

That is - the short range of a particular commit's parent to that commit; like

 git-diff 3435fdb4c!

Or similar.


Andy
-- 
Dr Andrew Parkins, M Eng (Hons), AMIEE
andyparkins@gmail.com