I've had a Calumet 400 wide angle model and still have a GVII. I gave the Calumet to a friend---not because I didn't lik it (I did) but because I wanted my friend to have a good 4x5 camera. I eventually missed it and replaced it with the GVII.
They are both fine cameras and capable of everything more modern (read expen$ive) cameras can give you.
My advice: Keep the one you enjoy using the most.
I kind of get a kick out of my GVII all tricked out on a Tiltall tripod---aluminium overcast!