What I said, was, in the post just above, that since using the Zeiss lenses, I prefer a sharper, more modern look than the Nokton 1.1 gives.
I also said, just above, that therefore I shoot it at f1.4 to improve its performance, as wide open is not to my taste.
I then said that if I'm shooting it as if it were an f1.4 lens, there's no point me carrying the extra bulk. I also said I would be happy to trade an extra stop of light (f1.1 to f1.5) for better performance.
I then pointed out that this naturally leads me to the conclusion that the Leica 50mm Summilux ASPH is the ideal lens fr me, as that can, and does, perform excellently when compared to the 50/2 Planar that I consider to be my reference lens for image performance.
I finished off stating that the 50 Lux is outside my purchasing power fr the next 12-18 months, so in the mean time I would happily trade the f1.1 for the more modern look of the current f1.5
If you got from that, that I was comparing an f2 lens with an f1 lens, then I'm not sure I can break down my reasoning any further, though I hope others will understand my reflection on my experiences and why, as a result, I might choose the 1.5 over the 1.1 - aka, the main quandary of the thread.