Last summer I sat down at our patio table with the intention of a last-light bino test, so from stock I had Diamondbacks, Viper, Fury's and Razor's against my Swaro 8x42 RF's.
Picking out a neighbours tiled roof about 150yrds away the results were very surprising, the Diamondback were very good, tile definition suffered about 5mins earlier than the Swaro's, Viper & Fury's in my opinion may have been a couple of minutes short of the Swaro's however through my 50yr+ old eyes the difference was very minimal, finally the Razor's didn't really appear to give any benefit over the Viper/Fury's even though they are a considerably higher price point.
For me being able to gain another 10-15 mins at last light isn't critical as for me this has created problems in the past so I practice I generally avoid..