Lifeboat from Titanic
Lifeboat to Carpathia
Confidence Level
Midtsjø, Mr Karl Albert ? (5 votes)
12? (4 votes)
? (5 votes)
12? (4 votes)

On April 19, 1912, Karl wrote a letter to his brother (On Board RMS Titanic, page 361):
    "Only a fraction came from it alive. I can’t really say I was afraid at all, and then not more than about 100 3rd class passengers, 210 of the crew, and the rest first and second class were saved. But some millionaires also went down the drain, as I have also heard. I have lost everything I had, clothes and money, so I don’t have anything other than what I wearing at the moment. Yes, it is no fun being in a little boat in the Atlantic Ocean.
    Because it was just about in the middle of the Atlantic. We lay in the lifeboats and thought now it is their turn, soon it is ours. Yes, it isn’t a joke when such a big vessel is sinking."
In another letter to his brother, unknown date, he described coming up to the first class deck before jumping from there into a lifeboat.
    "I was calm. But you know, you hear a lot in few minutes time. You emptied a lot of beer kegs and other kegs to get something on which to float. When I took to the lifeboat, there was already water in the bow.
    I was afraid that we would be sucked down, but there was no suction. The Titanic sank quietly and calmly. There was probably a lot of air in it. I tied life belts around quite a few. I saw one of the other boats capsize and the people cling to it’s keel. Some had built sort of a raft out of what they had found and kept afloat on those unseaworthy devices until they froze to death or were washed overboard.
    We suffered horribly from the cold. Most were thinly clad and many lacked shoes and clothing. One person died in my boat, but many also died on board the Carpathia.”
Titanic: 31 Norwegian Destinies by Per Kristian Sebak, page 79:
    "Johannes Nysveen and Karl Midtsjo had become good friends on the journey from Southampton, and were now standing on the boat deck. Johannes realized that the chance of survival was very grim, so gave his coat and valuable watch to Karl. Soon afterwards, Murdoch asked for more competent seamen for boat 15. Karl explained about his background, and so was permitted to lower himself down a fall. Johannes could only stay behind and watch." 

Yet he hid in the bottom of the boat once he got in!  It sounds like an interview he must have given that wasn't quite as honest as his letter.
Midtsjo may have also been in #12, as they took on board the deceased man from collapsible B.
Midstjo's report in another interview of someone being shot could be based on his hearing the gunshots at boat #14 if he was in #12. Of course, that could apply to some other boats as well.
Since we seem to have no evidence as to #15, boat #12 might be a possibility.