If you could only have one lens, what would it be?

I would have to go with the Nikkor Nikon 24-70 2.8

Canon EF 24-70mm f/2.8L II USM

I would have to go with the Nikon 50mm 1.4G Prime.

Carl Zeiss 50mm f/1.4 Planar ZF

Tokina AT-X Pro 50-135mm f/2.8

I would go for all around lens like the 18-300mm

the Leica Noctilux .95 50mm would be my wish

Pentax DA* 16-50mm, without a shadow of a doubt. Though I'd miss my smaller lenses :(

It will be the CZ  24-70mm 2.8 for my alpha a99 full frame

Pentax 31mm 1.8 limited - Gorgeous piece of glass 

I would have to go with a 50mm lens

I would go with Nikon 105mm f/2.8 VR Micro

Nikon AF-S DX 18-300mm f/3,5-5,6G

Tamron Zoom Wide Angle-Telephoto AF 28-300mm f/3.5-6.3 

I would get the 8mm rokinon 3.5