For birding, my choice of optics will depend on whether I’ve also taken a scope and of course habitat (woodland or open country). My regular binoculars of choice include 8x32 EL, 8.5x42 EL, 10x32 EL, 8 & 10x42 NLs, 10x42 SF, 10x42 Noctivid and 12x50 EL
I had the opportunity to test the 14x52 yesterday while using my own 10x42 NL. They also let me compare against the 12x42 NL in-store. Handheld there was just no compelling reason for my even considering walking away with the 14s (I was kind of surprised). Any benefit of extra magnification was eroded by my inability to secure a steady enough view, even when bracing my elbows on a hide shelf. I’ve no doubt that on a tripod, they would be more impressive.
The 14s were good, but the steadiness and view through the 12x42 was far more tempting to me (I’ve looked through these before and always felt them to be excellent). I wished I’d had my own 12x50s with me to compare. I may just have walked away with the 12x42s. I was again surprised how steady I could hold them.
For the record, I rarely encounter rolling ball, veiling glare or any other distortion effects in any of my optics. I guess I’m either immune or able to filter out these distractions on a subconscious level.