I wanna throw in my experience, I use a Surface (not pro) 3 (128gb version) and its pretty rad for drawing. I got it when it was fairly new for $800 (thats including the keyboard and the pen and whatnot). Now you could probably find a used one for $500, which is a quarter of the cost for basically the same functionality as a SP4. The things you're missing out on are a fancy kickstand, a larger screen, abd less pressure sensitivity, which honestly doesnt matter at all unless you're working on large canvases, like 24x17 at 800dpi, which is overkill for most comic stuff. I work on a 11x17 canvas at 350dpi.
Personally, I dont really care about the kickstand, i've used Pro 3's before and thought it was neat but realistically I dont use any of the weird angles you can get. The kickstand on my device is good enough.
I also didn't really care about the larger screen, in fact the smaller screen on the S3 was a big selling point for me, because it makes the device easier to carry around in my bag.
The only reason I would consider upgrading to a SP4 is that it has newer and fancy-er guts, which would be good for doing video editing, detailed 3D rendering, and videogames. I'm not working on video editing stuff any time soon, I dont do any 3D rendering, and I'm fine playing games from 2011 or indie stuff, so yeah.
The newer model of the pen (which works on all surfaces after the SP2) comes with a couple of different nibs that have different textures, the one that I use is just the default one, it feels sorta like using a Nintendo DS stylus. Keep in mind that with any digital drawing device you're going to have to get used to how it feels, wether it has a paper texture or not.
The last thing I would point out about getting a surface tablet is that they're REALLY awkward to get used to in general, not just for drawing. It took me like, two months to get to a point where I was comfortorable using the thing. My girlfriend has to use it sometimes and she absolutely hates it. If you can I would recomend going to a store and getting some hands-on experience with it first just to see if you can stand it. There are still some quirks that I haven't gotten used to, and I've had it for almost a year now.