Help configure font in emacs xft cvs

[leon]

Dear all,
I'm using the latest XFT_JHD_BRANCH of emacs but have some problems
with the font. I post the question here in case someone might have a
fix for it. I thank you in advance.

The problem is: starting emacs with "-fn 'mono-10'" command line option
and by (set-frame-font "mono-10") in ~/.emacs have different effects
with the former being prettier. Have a look at the following
screenshots:

http://people.pwf.cam.ac.uk/sl392/emacs/emacs-xft-pretty.png
http://people.pwf.cam.ac.uk/sl392/emacs/emacs-xft-ugly.png

Any idea why the latter does not produce the same appearance? Any
recommendation for setting a nice anti-aliased font?

-- 
Leon