No. Plan 9 has a different approach to editing and
development environments, such that emacs and vi
are not a good fit.

You can check the following manual pages for details

http://plan9.bell-labs.com/magic/man2html/1/acme
http://plan9.bell-labs.com/magic/man2html/1/sam
http://plan9.bell-labs.com/magic/man2html/1/emacs
http://plan9.bell-labs.com/magic/man2html/1/vi

There are discussions at length in the mailing list archive
as to why such venerable editors are not used, and why
there is little motivation to use them, even less port them.

http://plan9.bell-labs.com/plan9dist has links to all
the papers and the distribution itself.