I'd agree with others that I can't see the need for a fast lens for landscape work, to be honest any of the cameras you are talking about can produce good landscape shots - but as has been mentioned you will see a drop in dynamic range. Natural light portraits is another matter and one that all the cameras will struggle with. The small senser size of the compacts means that you really cannot push the ISO very high without suffering badly with noise (I've yet to see a compact that can perform well about ISO400 and many need lower than that). The mirrorless cameras (Panasonic G series and Sony NEX) are significantly better at handling noise (probably a stop or two better than your 10D) but do have other issues. The lack of available lenses is a big issue and the fast primes for both systems are quite short and thus not ideal for portrait work. Also the AF systems on these cameras to not handle low light as well as a DSLR and teh lack of viewfinder can make MF tricky...
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