Ok, if you did a lot of birding in low light which binocular would you prefer a Nikon Monarch HG 8x42 or a Zeiss 8x32 FL? Which one would perform better? remember the Nikon is pulling in 72% more light.
One thing that, interestingly, no one thought to ask was - when referring to birding in low light, just how dark (or otherwise) are the conditions? I'll bet that what each of us considers "low light" is going to vary from person to person. For some it might be almost darkness, for some it could be the grey light of pre-dawn, for some it could be what's called "civil twilight", for others "nautical twilight". Maybe you could give us some examples, from your experience in the field, of what birding in low light means?
Of course, it could also be asked - how much low light birding (in any kind of low light) do you actually do as a proportion of your birding in total? Or indeed, how much birding do you actually do, full stop?