Yes - I wouldn't be looking to compare a PFL Mk3 to a PFL Mk4 - there's just too much difference (not to mention the ten years or so inbetween them). As an aside, you can see the comparison between the Mk4 PFL and FL here. Just like the 3 to 3.5, most of the differences are under the hood. I should also explain that my Occy is almost the best of both worlds - for me, anyway. Among other things, it has the digi dash and ACC, along with TSR. I get nice features, along with a slightly nicer driving feel. Of course, I also get phyiscal knobs, and the ability to turn all the safety stuff off - permanently. Had I not been able to find one with the digi dash, I would have likely dug around for a Mk4. I just, personally, really dislike the Mk3.5 analog gauges. That said, I also sort of hate the Christmas tree lighting in my car now - I have the 2000s green switchgear lighting, the white infotainment and then the modern digi dash. It does clash a little bit. Whoever specced my car also didn't tick power fold mirrors, which annoys me too. The interior of the Mk4 is absolutely streets ahead - it's my only gripe with my car, really (beside the tail lights). The newer model has alcantara and such, whereas mine is nasty plastic. Similarly, the new model is full LED with a rear light design from this decade, whereas the half LED/half halogen setup on my car looks like they took it from a Mk1 Fabia. There are bigger issues, but every time I see a 7.5 GTI I do long for some nicer rear lights. In terms of the headlights, it depends. If you look at the Matrix unit of a Mk4, you will see two units (almost like eyes). By comparison, by car only has one of these units, with the rest of the full beam coming from a different unit in the smaller split headlight. I personally think the Mk3.5 are more than enough - although I do wish I had HBA (High Beam Assist). On a dual carriageway I find full beam too bright, as it reflects too strongly off of signs. Up in the north of Scotland, I find them more than enough too, at whatever speed I'm travelling at. That being said, they aren't a Matrix system. If headlights are the most important factor for you, then get a Mk4. i weighed up the differences and decided that a better driving experience, with favourable controls and looks outweighed spending an extra £5,000 on a Mk4 (this was early last year). If I were to choose an Octavia again, I'd still get a 3.5 with options.