Upright/diamond frame riders operate in a different performance envelope.
With that in mind, On my Cruzbikes I've caught and passed every other recumbent I've ever met on the hills.
FWD Cruzbikes, like upright bikes, have the advantage when going uphill.
I like to remember the time I (on my '07 Sofrider) caught up to a beautiful purple P-38 recumbent bicycle on my favorite flat road.
We rode together until the road got pretty hilly and the P-38 rider slowed too much for me.
Never saw that bike again.
Another time, I intercepted (on my '11 Vendetta) a beautiful blue Bacchetta CA2 on a slight downhill and drafted him for a mile or so,
until I felt the desire to resume my workout. Drafting him, well, was too easy.
The vendetta pulled steadily away until the overpass, where I left the CA2 standing still. Not really, of course, but the speed differential was pretty wide.
On the downhills, Bacchettas always won VS my Sofrider and have a chance to keep pace with my Vendetta.
Overall, Cruzbikes rule.