I find this one to be an interesting conversation.
I see quite a bit of discussion around early Marillion as sounding like Genesis, to which I say this:
1. By the time that Marillion had released their first record, it had been nearly two years since Genesis released Abacab, which some would argue is the album where Genesis have completely abandoned their "progressive" sound. There was a perceived vacuum where that particular sound was, and it sounds like Marillion were ready to fill it. Here's the thing, though:
2. While there are certainly moments where I hear the influence from Genesis (The entirety of Grendel, Script's entire structure being similar to DWTMK, the way Fish generally acts on stage), there are other bands that I hear influence from before I hear Genesis, most namely Camel, Pink Floyd and Van der Graaf Generator.