In my mind, the point of a good fast lens is that they are usable/sharp/sharp enough/characterful at full aperture and then also look great at f/8 or f/11 (where every lens looks good). Some of the fast lenses are large...and then they become a bit more burdensome to haul around, but a good Noctilux or f/1 Nokton look so good at f/1 that the burden becomes more manageable. Lenses like the 35 lux ASPH or this Light Lens Lab offering are only marginally larger than their Cron counterpart. In hand, for me, there is basically no real difference in handling. Whether or not you like the look of more blur is one thing. Also, accepting that the failure rate is going to be higher is another.