Looking at the various rust issues and responses posted in this thread it is looking as though the appearance of rust could be highly dependent on how the bike is cleaned. I might be making some contentious statements, but here goes:
The MT-07 requires much more thorough and frequent cleaning/protection than other bikes due to low quality finishes. For example I could get away with quite sporadic cleaning of my CBR600 throughout winter and it still came up shiny, fur-free and rust-free. Not so with the MT-07, at the moment I am cleaning it after every ride using a cold wash followed by a spraying of Scottoiler F365. This, at the moment, seems to be keeping the bike shiny and rust-free. I daren't even leave it overnight before a clean!
I'm not a believer in using ACF50. Not because I don't think it can protect against salt and corrosion, but because I think it is easy to spray it on and think your whole bike is going to be protected throughout winter. What if you didn't cover all areas adequately? At the end of winter when you clean all the muck off you may find corrosion in these areas hidden all winter by the muck you thought was sitting on top on the ACF50. Also what about the brake disc bobbins - these seem one of the worst targets for rust yet are not safe to spray with ACF50.
I thought SDoc100 would be a good treatment for cleaning the MT-07, but I've found that the quality of finish of some parts of the MT-07 is so poor that even this eats into the finish after only 5 minutes of application. Notably the 2 water pipes on the RHS of the bike (see
http://www.motorcycle-talk.net/forum/mt-07-fz-07-modifications/532-chroming-front-water-pipes.html#post10332 which I thought was salt but I've now proved it was actually the SDoc100 eating into the paint).
So it may be a lot of work and associated paranoia, but at the moment I'm spending an hour after every ride cleaning my MT-07 in an attempt to keep it looking good all year round. Personally I would have paid another £500-£1000ish for Yamaha to improve the durability of this bike.