A couple years ago at a gun show I did a simple side by side (non firing) comparison of several S&W 640 vs several Taurus CIA pistols in .357 Mag.
The CIA's won hands down. Better fit, tighter actions and smoother triggers. Not what I expected, but it was plain as day.
I do marginally wish I had the CIA as opposed to the M605 with a hammer, a good gun in it's own right.