Cmo, this "lean" thing is pretty subjective. I don't really know if you will consider it lean in your system or not. I do know that the Lyra Helikon is a very highly regarded cartridge, and I think it would not have that reputation if it had any real serious problems. It may be a bit on the lean side in some settings, but I doubt it is too far from correct.
If you are at all concerned about that, then go for the ZYX Fuji. I think that the ZYX is probably a couple of hairs better than the Helikon anyway, and it doesn't have a problem with a lean or dry sound. It is one of the most detailed and delicate cartridges that I know of. It is fully equal to the Shelter 901 in just about every way. The ZYX even betters the 901 in delicacy, and the Shelter is a little better in symphonic large-scale music and has about the best bass response of any cartridge I know. Overall, the Fuji and the 901 are about a head-to-head tie, with each one outdoing the other very slightly in certain areas. I think the Helikon is more around the level of the Shelter 501, which is certainly not bad, since the 501 is the cartridge that I use myself. These are all great sounding cartridges, and as I said before, you are not going to be disappointed with any of them. It is just splitting hairs to decide between them. Any way you go, your analog system will sound excellent with any of these cartridges. If you tie me down to a pick, I'd pick the ZYX Fuji.
If you are at all concerned about that, then go for the ZYX Fuji. I think that the ZYX is probably a couple of hairs better than the Helikon anyway, and it doesn't have a problem with a lean or dry sound. It is one of the most detailed and delicate cartridges that I know of. It is fully equal to the Shelter 901 in just about every way. The ZYX even betters the 901 in delicacy, and the Shelter is a little better in symphonic large-scale music and has about the best bass response of any cartridge I know. Overall, the Fuji and the 901 are about a head-to-head tie, with each one outdoing the other very slightly in certain areas. I think the Helikon is more around the level of the Shelter 501, which is certainly not bad, since the 501 is the cartridge that I use myself. These are all great sounding cartridges, and as I said before, you are not going to be disappointed with any of them. It is just splitting hairs to decide between them. Any way you go, your analog system will sound excellent with any of these cartridges. If you tie me down to a pick, I'd pick the ZYX Fuji.