Size and weight of an exotic 50mm f1.2 lens rarely becomes a deciding factor between different mounts but here at Camera Decision we still like to compare anything and everything! Here is a size comparison of Sony FE 50mm f1.2 GM vs Nikon Z 50mm f1.2 S vs Canon RF 50mm f1.2L USM Lenses.
As you can see, Nikon obviously chose a completely different approach to the optical formula of Nikkor Z 50mm f1.2, being significantly taller and heavier than the other two. Sony managed to make the FE 50mm F1.2 GM Master impressively compact, it is the lightest of the bunch at 778g, has the same length with Canon RF50mm f1.2 at 108 mm but slightly smaller in diameter.
The Sony FE 50mm f1.2 GM has a filter thread of 72mm whereas the Canon RF 50mm f1.2L USM has 77mm and the Nikon Nikkor Z 50mm f1/2 S has a whopping 82mm filter thread.
Besides its size advantage, the Sony 50mm f1.2 also has the lowest MSRP of the lot at $1999. Nikon Z 50mm f1.2 comes at $2099 and Canon 50mm f1.2 has an MSRP of $2299.
See the side by side specs comparison of these lenses here.