An M4-2 is cheaper.
When the Nikon F appeared the photoj carried a motor drive F with 5cm and M2 with 3.5 cm f/1.4.
The poor ones substituted a Canon P with a Canon f/2 35mm LTMp for the M2.
In dull light and low contrast the Canon 1:1 finder is faster than M2
So id still pick a M2 with a (Cosina) f/1.4 35mm or the above Canon P and 35mm f/2.
Move in closer with a 35.