Still cannot enter characters but using tab to auto-complete will work so long as the file does not begin with a "foreign" character:
sftp> get caf\303\251
Fetching /tmp/café to café
sftp> get na\303\257ve
Fetching /tmp/naïve to naïve
sftp> get anasth\303\246sia
Fetching /tmp/anasthæsia to anasthæsia
Sadly entering the "\303\246ether" for "æther" doesn't work.
Version: 1:5.9p1-5ubuntu1.1
Still present.
Still cannot enter characters but using tab to auto-complete will work so long as the file does not begin with a "foreign" character:
sftp> get caf\303\251
Fetching /tmp/café to café
sftp> get na\303\257ve
Fetching /tmp/naïve to naïve
sftp> get anasth\303\246sia
Fetching /tmp/anasthæsia to anasthæsia
Sadly entering the "\303\246ether" for "æther" doesn't work.