The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Rokinon 24mm f1.4 and the Olympus 11-22mm f2.8-3.5 for their suitability to various photography scenarios:
Size and Weight Comparison
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Olympus 11-22mm f2.8-3.5 weighs 485g, 16% (95g) lighter than the Rokinon 24mm f1.4's weight of 580g.
Filter Threads
The Rokinon 24mm f1.4 has a filter size of 77mm whereas the Olympus 11-22mm f2.8-3.5 has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Rokinon 24mm f1.4:
And these are the 72mm filters that we recommend for the Olympus 11-22mm f2.8-3.5:
Lens Mounts
Both the Rokinon 24mm f1.4 and the Olympus 11-22mm f2.8-3.5 has the same Four Thirds lens mount. Some of the latest released cameras that are compatible with the Four Thirds lenses are Olympus E-5, Olympus E-600 and Olympus E-620.
Rokinon 24mm f1.4 is also available in the Canon EF , Nikon F (FX), Pentax KAF, Sony Alpha and Samsung NX mounts.
Focal Range
Rokinon 24mm f1.4 is a prime lens with fixed focal lenght of 24mm.
On the other hand, the Olympus 11-22mm f2.8-3.5 has a focal range of 11-22mm and 2.0X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 22-44mm when used on a FourThirds format camera.