The facts don't support your claims.
Both the Fit and the Yaris come standard with A/C and all Fits come standard with power windows and locks.
http://automobiles.honda.com/fit/specifications.aspx
The Fit also comes standard with a better sounding, more powerful stereo, four doors, a tach, a multi-information display, superior seating, a rear window wiper/washer, a telescoping steering wheel and a more powerful engine.
Futhermore, the Fit's automatic trans is a 5 speed, while the Yaris's is a 4 speed.
The Yaris that would come closest to the equipment level of a base Fit would be an appropriately optioned, 5 door hatch "S." The sticker on that would be $16,855 (including destination).
The Fit would still offer more equipment (as I noted above) and would sticker for $16,220 (including destination), which is $635 LESS than the Yaris!
http://www.edmunds.com/
The prices I provided are for the automatic transmission models.