Keith
The best camera is one that still works!
This was shot with Portra 160 VC.

dct
perpetual amateur
I'm in C-41 negatives, cannot talk on positives. I support not using Kodak Ektar 100 for flowers, doesn't make difference if RF or SLR. I shot Ektar alot but not for botanics. The color gradient of red and greens "out of the box" doesn't look right for me. I like standard Fujicolor film for this purpose.
Examples with different C-41 emulsions:

Fujicolor C100 (the last roll)
in Ricoh 500GX

Kodak Gold 400 (expired) in Minolta Vectis S-1

Fujicolor C200 in Konica Hexar RF
Examples with different C-41 emulsions:

Fujicolor C100 (the last roll)

Kodak Gold 400 (expired) in Minolta Vectis S-1

Fujicolor C200 in Konica Hexar RF