This is 100% available light, no modifiers. Ektar looks amazing in flat lighting, just shoot it at ISO 50 and expose for the shadows!
I used to shoot a lot of portra 400, it's easy to shoot, but I got sick of the brown/orange tone it has for skintones. I much prefer the pink tones from ektar, 160s and 400h. Portra made people look like they had jaundice a little too much for me.