Ok, First off, I have no clue of a release date or even seen this lens. Just after reading the post about wither to get a 300 2.8 or wait for the 200-400 to come out. It made me think and I wanted to crunch some numbers of lenses that are already out there.

With all that being said, here is what I came up with.

The Weight:

Let's compare

Nikon 300 2.8 - 6.3lbs

Nikon 200-400 - 7.3lbs

Nikon 400 2.8 - 10.2lbs

Canon 300 2.8 II - 5.18lbs

Canon 400 2.8 II - 8.5lbs

1.4 converter - .5lbs

difference between 300-400

Nikon 300 is 62% the size of the 400

Canon 300 is 61% the size of the 400

so we have a close enough comparison.

so Nikon's 200-400 is 116% bigger then Nikon's 300

So we would get a Canon version of the 200-400 being around 6lbs adding .5 lbs for the converter you get:

Canon 200-400 with 1.4x - 6.5lbs

Now going onto Price*:

*based on current prices on their websites

Nikon 400 2.8 - $9550

Nikon 300 2.8 - $5900

Nikon 200-400 4 - $7000

Canon 400 2.8 - $11500

Canon 300 2.8 - $7300

Canon 1.4x converter - $500

Nikon 300 is 62% of the price of the Nikon 400

Canon 300 is 63% of the price of the Canon 400

so we have a close enough comparison.

Nikon 200-400 is 118% the price of the Nikon 300

so if we take 118% of the Canon 300, we would get around $8600

adding $500 for a converter

a Canon 200-400 f/4 with 1.4x converter - $9100

curious what others think. I tried to do this as logically as possible.