I just beat King's Field IV: Ancient City last week and was absolutely blown away. I'm a huge fan of all three Souls games but otherwise hadn't played any FromSoft titles. I was initially only interested in KF from the historical perspective but it ended up far exceeding my expectations.
The control, especially turning speed is extremely slow. The running speed is still slow but not too bad and was necessary to allow for in-game loading and no loading screens (like Dark Souls). I would recommend remapping the movement buttons to the D-pad (forward, backward and strafe) and face buttons (look/camera movement) to mimic dual analog sticks, with magic on L1, attack R1, and run/interact as R2. It's surprisingly palatable once you get a feel for it.
I absolutely fell in love with the atmosphere and tone of the world they created. The music fits perfectly, the 1st person perspective really sucks you in, and the world and level design were first rate. The world design is a brilliant combination of Dark Soul 1's verticality and DS2's hub and spokes. You can go off exploring for hours through multiple new areas and then suddenly open a shortcut back to an earlier area, that same WOW moment from Dark Souls. It's also remarkable how well the feeling of Souls combat is already expressed here, the rhythm of stamina management and spacing yourself relative to the enemy. It's also crazy how many specific characters and areas were essentially reused in the Souls games.
I didn't find it very challenging and finished a totally blind playthrough in 25 hours but was absolutely engrossed the entire time. It revived that sense of mystery and exploration that was lost in the simpler level designs of Dark Souls 2. I would give it the strongest possible recommendation for any big Souls fan who doesn't get hung up on graphics and can adjust to the slow character speed. You might just fall in love like I did...
Played only the first few minutes but the presentation of victorian alternate 1900s is really intriguing, the main character is already pretty unique too. 
