The only acceptable bend in a "straight" one-piece soprano is the one found in the necks on one of the established bent-neck straight sopranos such as the YSS-62 series. I've seen a straight, one-piece bent neck Yani once...it was a special model (S-902R) that was made for a very limited time. I've heard of people modifying their MKVIs to have a bent neck.
I have had a couple of bent sopranos...one of them was very slight and you almost couldn't notice it. It played top to bottom, but intonation was never the best. The other one was quite noticeable, and wouldn't play without being worked on. Neither showed the classic signs of trauma you would expect (kinks or bends at the tone holes). The one that had the noticeable bend was bent towards the palm keys, just as yours is. I cannot for the life of me imagine why someone would bend the horn purposely towards the palm keys...that is a sure sign of damage.