Which lens do you plan on getting next, if any?

[Joel Eade]

My current line up:

1D MKIV
1D X

Sigma 8-16mm
Canon 17-40mm f/4L
Canon 35mm f/1.4L
Canon 65mm f/2.8L MP-E Macro
Canon 24-70mm f/2.8L II
Canon 70-200mm f/2.8L II
Canon 180mm f/3.5L Macro
Canon 300mm f/2.8L I
Canon 500mm f/4L I
1.4 X TC Version II
2.0 X TC Version III
Canon 12.5 mm and 25 mm extension tubes

Wish List:

Sell the Sigma 8-16mm and get a good ultra wide prime (perhaps a Canon tilt shift 17mm, Canon 14mm or Zeiss 21mm)
A good 50mm prime (perhaps the new Sigma)
Trade or sell the 500mm and get a 600mm f/4 version II
Hoping Canon will make a full frame very high megapixel body so I can stop reading about the D800
Pentaz 645Z medium format body with an adapter for the Canon 800mm f/5.6L Lens