[Brightcolours]

Let me fix that for you

• Pany 200 f2.8: 8,75 x 17.4 cm, 1245g, $3000
  
• Canon 200 f2.8: 8.38 x 13.72 cm, 765g, $750
  
• Canon 400 f5.6: 9 x 25.6 cm, 1250g, $1250
  

Doesn't change much about the conclusion, though. Yep, insanely expensive, even though it comes with a free TC...
 

Regarding comparing with the Canon EF 200mm f2.8 L II:

• It makes sense to compare it, because the same focal length and max. aperture, should give a comparable price
  
• Still not fair to compare it, because that Canon lens is a really old lens, with a really deflated price. A new Canon EF 200mm f2.8 L IS USM would not cost $750. Probably also not as high as $3000, though 
  

Regarding the EF 400mm f5.6 L USM:

• Makes sense to compare it because it is equivalent (don't let Wim hear that)
  
• Not fair because that Canon is also really old, with a really deflated price. A new Canon EF 400mm f5.6 IS USM would not cost $1250.