Which Canon L lenses offer a big advantage over their non

Only you can answer this question. What gaps do you have in your bag for the type of photography you enjoy? When you visualize a scene and go to grab the appropriate lens, what range is limiting you currently?

Do you frequently see motion blur in your buy wow gear subjects? Maybe that indicates that you need to chose something with a wider aperture then you have currently, such as upgrading to a f/2.8 70-200mm lens.

"Outdoor photography" encompasses nearly every lens type in the book. You could pick up a tilt shift lens, macro, or fisheye. You already have roughly 16-200mm covered, but what about 200mm +? Outdoor photography many times requires upwards of 400mm which you don't have covered at all right now.

Canon currently offers around wow gold 20 "L" series lenses. Lets review each of the criteria you set:

Good for wow gold outdoor photography - Basically all lenses fit this

An L lens - 20+ lenses

Offers a great advantage over non-L lenses - True of all L lenses or the market wouldn't have a need for them at the price they demand

Doesn't overlap with your existing kit of three lenses - So this just leaves out really the three you already have, and maybe the 50 f/1.2 and the 70-200mm f/4 IS

So after filtering out all of the criteria that you provided, I'm down to a short list wow items of only 15 L series lenses that are currently in production. That is why we are back to the idea that only you can answer this question. What do you want to do tat you can't right now? What are your needs? Where would a piece of equipment help improve your photography?

If I had your setup, I think that I would spend a little more on the lenses and get the 24-105mm wow gold or the old 24-70mm (not the II) lens, as these would fill the gap of very usable focal ranges that you have only covered by your 50mm. After all, you are spending around £3000 on a body, why not spend a little more on lenses. They go for about £850-1000. I personally have the 24-105 and I am extremely happy with it.

But as I understand it, your reseller will let you pick a lens for free up to the price of NOK3000? Perhaps you could convince him to just pay for what the lens costs in excess of NOK3000?

But if the price is more or less set, you might go for the 100mm non-L macro lens. It should be almost as sharp as the L counterpart, but lacks the image stabiliser. But having the L version myself, I wouldn't want to have the non-L version as I have shot many macro shots hand-held, something I would never be able to without the image stabiliser. But that could be a good bet considering the given circumstances.
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