Question about different usage of Channel Width on Multipoint Antenna

Hello Mikrotik community,

Currently we are using Netmetal 5 antenna's on 5Ghz AC Band + NV2
Channel Width on 20/40Mhz Ce

All clients connect to this multipoint antenna with the same preset 20/40MHz Ce channel.
But not every client has the same maximal bandwith usage, for example client 1 can use maximum of 20/20Mbit, while client 2 can use maximum 100/100Mbit.
Will the connection quality improves when al ( slow ) clients connect using only 20Mhz channel, and de faster clients ( for example client 2 ) using 20/40 Ce

Please let me know if this would work, or will the performance degrade?