After playing for a while I must say it's better then I expected to be. They have clearly been doing optimizing on the engine, so I can play on highest settings with a solid 60 FPS on my aging GTX 660, so it definately runs better then 15.
Sounds are much better too, there is a difference between being in and outside the tractor, and both tractors as well as equipment have got distinctive start-up sounds now.
Textures are clearer, but especially the lighting is much better. Where in 15 you had a 'flashlight cone' of light, now each light is a seperate lightsource, including brake/reverse/indicator and beacons, which clearly reflect off your equipment and other surfaces.
Cranes are much more sturdier, which is especially noticable on the logging equipment. No more 'flappy joints', but firm equipment that reacts much more natural now. Behaviour of logs and fallen trees has very much improved, and being able to handlift light bits of wood helps tremendously. It also enables you to saw a wedge out of a tree, take the wedge out and have the tree falling into the direction you want when felling by hand.
There is a lot of task specific equipment, and each implement has clear description of what it needs, what it fits to and what it does.
Next to that, giants has a bunch of mods available at their website already, including the ITrunner pack, and a bunch of loose implements, buildings etc.
But what I'm most happy with is they have released 3 parts of their '4real mod' series.
The fist one causes wheels to destroy crops when driven on, which fits the game perfectly as you can upgrade tractors to have narrow tires or care tires, which will not destroy crops when you drive through the field.
The second one seperates the wheels from the chassis when it comes to getting dirty. It works per seperate tire, and it looks much more realistic with tires getting dirty fast, while the tractor itself gets dirty much slower.
But then the third 4real mod... Im absolutely delighted with this one; it's called the ground response mod, and it makes the tires behave differently per surface. It's basicly a physics mod, and they have done well, very well I must say:
Concrete slabs feel bumpy, dirt roads even bumpier, and fields, yep, you rock and roll there, where not only your wheels but also your tractor shakes noticably, and, especially in first person it gives you the illusion that your driving on a farmers field.
Next to that, tires will sink in the surface depending on what it is, a bit on a field ( so when one side of your tractor is on grass and the other half on the field you noticably lean over, and much more on ploughed ground.
When conditions get rough (uphill on dirt), or wet, you'll also get wheelspin. Despite no FFB, visually it does a great job at giving you the feeling you are on a farmers field, where in 15 there was no difference at all between driving on a road oir on ploughed ground. I'm absolutely loving this (official) mod.
There are much more little things that have improved, but that would make this bit way too long to read. If you do get the game, make sure to at least get the 4real mods at the official site!:
http://www.farming-simulator.com/mods.php