I have a penchant for super fast lenses like my Olympus M.Zuiko 17mm f1.2, with extra light gathering power, beautiful soft and buttery out of focus blurry backgrounds when used wide open, and fast and accurate AF capability. Along with IBIS it allows me to work in very low level light at slow ISO speeds for maximum image quality.
This lens is a lovely bit of glass that lives well up to its reputation for quality and performance. Constructed of 15 Elements in 11 Groups (1 Super ED lens, 3 ED lenses, 1 ED-DSA lens, 1 EDA lens, 1 Super HR lens, 1 aspherical lens), it is equivalent to a 34mm focal length lens in so called full frame format if you insist on such things. For me, it is my super fast "normal" lens.
In fact it is part of a trio of f1.2 Pro primes that I own the other two being the 25mm and the 45mm (50mm and 90mm equivalents) which are optically as good as the 17mm, which is to say lovely jubbly. All three render beautiful blurred backgrounds to out of focus areas and provide lovely contrast and colours overall with the ability to delineate detail and make images pop in a most pleasing way.
Then there is my OM System M.Zuiko ED 20mm f1.4 Pro which sits nicely between the 17mm f2 and the 25mm f2 and is much more compact at f1.4 and is a nice compromise in focal length, speed and physical size when I want to travel with one "normal" standard lens.
To round things out, there is my Olympus M.Zuiko ED 75mm f1.8 which is a lens that well lives up to its reputation of being one of the best MFT lenses ever made even 12 years on from its introduction in 2012.
Available light working with all of these lenses is a doddle and when used in conjunction with IBIS (in body image stabilisation) of my Pen-F camera they allow me to work at low ISO levels for maximum possible image quality. They all can be used wide open with absolute confidence and to great effect.
So, there you have it, five super fast primes of exceptional quality, mobility, capability and performance - now all you need is a photographer to match.