I don’t know where I came up with $10Gs, but even at $5300 that seems a lot. I could get past the looks if it shoots nice. What are they like to shoot? The Manhurin looks nicer but something makes these guns expensive.
The Manurhin is L-frame sized, the NX Korths are much larger and heavier. The 8-shot .357Mag (NXS) is 3.84 pounds with comp and underlug/barrel weight, that's heavier than any S&W N-frame ever produced (to my knowledge). The Manurhin MR73 should be compared to the Korth National Standard (Nighthawk Mongoose) at $3700, same size, same capacity, similar looks etc.
Between these 2 revolvers, I'd chose the Korth, it beats the Manurhin in every respect except maybe the finish. The Korth has a matte DLC finish, it looks good and is supposedly very durable, but the deep black polished finish of the MR73 is more interesting, it's unusual and, when freshly cleaned (it's a fingerprint magnet), really pretty.
If you're going for a new (Chapuis produced) MR73, make sure to check out as many guns as possible, they are NOT all the same. Some have stacked DA pulls, some have no stacking at all. One I checked out a couple of years ago became much lighter towards the end of the DA pull, surprising you. That was really annoying. Also pay attention to the cylinder release, some are really rough (the movement, not the surface), some are wobbly. The forcing cone is another area worth paying attention to. Make sure there are no imperfections. You really have to find yourself a good one.