Haven't used an Ortofon arm in ages but I agree with Audiofeil. The current versions of Dynavector, Phantom and TriPlanar are in quite a different league, especially with a revealing cartridge like the Atmos.
The other arms you mentioned are not in that league either. Some of them aren't even close.
SME IV or V probably come closest, but IME with several cartridges they lack transparency to low level detail and harmonics (at which ZYX's excel), they lack effective VTA/SRA adjustment, some lack azimuth adustment and their inability to adjust offset angle at the headshell inhibits true optimization of cartridge/arm/table alignment. SME's are beautifully made, solid and easy to use, but the first three arms you listed will allow an Atmos to show you more of what it's capable of.
The other arms you mentioned are not in that league either. Some of them aren't even close.
SME IV or V probably come closest, but IME with several cartridges they lack transparency to low level detail and harmonics (at which ZYX's excel), they lack effective VTA/SRA adjustment, some lack azimuth adustment and their inability to adjust offset angle at the headshell inhibits true optimization of cartridge/arm/table alignment. SME's are beautifully made, solid and easy to use, but the first three arms you listed will allow an Atmos to show you more of what it's capable of.