Thank you for your comments on my response to the OP’s question.
Your critique is factually incorrect.
I DID note that the 24 was different to the 35 in respect of background separation.
It is noted in my comment here:
“If the camera format is limited to 135 ("Full Frame"), then for a W&E kit the better choice is still the 24/1.4MkII as one
can shoot wider and crop effectively to make the equivalent 35 FoV, though with a slight loss of DoF leverage and a slight change of perspective.”
Apropos your comment that the 24 “lacks” the ability of separation: I disagree.
As well as citing the samples provided above, here are some more:
And using the perspective of a close 24 combined with a lower camera angle whilst still using a small aperture to provide a large DoF:
And on an APS-C:
The OP asked which lens, with respect to BOTH camera formats and also noted later that both lenses would eventually be purchased.
I stand by my comments that the 24 is the better first purchase and the for the reasons outlined and certainly I was not overlooking the nuances of background separation, you mentioned.
You mentioned that you own the 35L – I own and use both the 35L and the 24L in a dual format kit and I make comparisons of both lenses, used on both formats, during my normal work-day, often.
WW