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It depends which you bought and what lenses you used on them. If you paid out £1800 for the D700 then you have all the old Ai/Ai-s, D lenses available to you. The only thing you would lose is the AF on the AI and Ai-S lenses. With Canon, you'd have to use adapters as the old FD mount lenses don't work on the EF bodies without them.
The loss of AF on the Ai/Ai-s lenses is certainly no big whoop at all for landscape photography. If anything, it will make you pay more attention to your focal point in the scene. Then select your aperture on the ring and that's it. You'd still have full metering on the D700.
I have the Tamron SP90. Its a nice bit of kit for macro. Its also good for portraiture, although it can hunt a bit and I find the focus wanders off a little. It is a pig mechanically though and slow to focus. I think the Sigma 105mm suffers the same. Not a problem really though, as macro is best performed manually. If you didn't want to pay out for the DI version, you could look for the older Adaptall-2 mount. Its slightly faster at f/2.5 but, you need the extension tube to get 1:1 ratio on the old version.
I think the Sigma 10-20mm is designed for APS-C sensor cameras. Same as the Tokina 116 too. Remember though, you don't have to go as wide on FF as you do on ASP-C. On your Olympus 10-20mm would be 20-40mm on FF due to the X2 crop factor. 15-30mm on Nikon DX bodies. Get an 18mm lens on the FX body and its going to capture the full 18mm.
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