Canon EF 200-400mm f/4L IS 1.4x Lens Review (superb image quality, cnet)

Canon EF 200-400mm f/4L IS Extender 1.4x
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• High-Performance Telephoto Zoom Lens
• Canon EF Mount
• Aperture Range f/4-32
• Built-in 1.4x Extender
• Three-Mode Optical Image Stabilization
• Ring USM Autofocus & Internal Focusing System
• Power Focus Mode for Smooth Focus Shift
• One Fluorite and Four UD Lens Elements
• Fluorine Front & Rear Lens Coating
• Highly Resistant to Dust and Water

c|net reviewed the Canon EF 200-400mm f/4L IS with built-in 1.4x extender, a lens that retails for $11,999. They attest a “superb image quality”, and write:

The Canon EF 200-400mm f/4L IS USM Extender 1.4X combines terrific optics, autofocus, and image stabilization with standout flexibility from a built-in telephoto extender.

You get you what you pay for with the Canon EF 200-400mm f/4L IS USM Extender 1.4X: superlative performance and flexibility.

The review has some samples shot with the 200-400mm.