My 18" GS is 23 3/8oz. (18" Chit. is 22 3/4)
An "oz/inch" is about as light as they get, and those are fairly scarce and go fast. The super narrow ones like the reti can go lighter.
It really depends on what Kami, and how he felt that day. Also some just don't or can't make deep fullers. One day Bill had two chitlangis for sale, and the difference between the two was around 6 oz or maybe more. Bura made the lighter one and even with Bill's old digicam, the photo showed a difference in the fullers.
If the light weight is due to a wide, thin concave bevel, then one might be wary about torquing when chopping. But my Chitlangi and GS both by Kesar are both pretty beefy edgewise.
My UBE by Bura kinda makes me uneasy how thin and wide the bevel is, even after I partially convexed it. So I baby it a little when chopping. On the other hand, I think I could do a decent job of slicing ham with the thing.