use utf8; doesn't mean that your perl(1) is going to use UTF-8 for input/output.

From utf8 (and please read it):

Do not use this pragma for anything else than telling Perl that your script is written in UTF-8.

As Khen1950fx pointed out, you should use binmode for outputting these 'wide chars'.

I suggest you read one of brian's informative/helpful posts and be sure to check out tchrist's OSCON Perl Unicode Slides.

Concern the perldoc when not sure.

HTH.