They still make the Quaternity.

In the engineering manual it implies that in DRY mode (as distinct from DRY COOLING mode) there is less sensible cooling as it approaches the humidity setpoint, but that's not the same as no sensible cooling in DRY mode. See the notes at the bottom of P49 (p50 in PDF pagination):

http://www.daikinac.com/content/ass...ta.pdf

The coil & valving diagram on p.8 (p.9 in PDF) implies that the coil on the indoor unit really is split, and operates differently in DRY mode, where it applies continuous re-heat with the split coil, whereas in DRY COOLING mode it does not (thus delivering a greater fraction of sensible cooling to latent cooling when in DRY COOLING mode, and conversely.)  But it does not dehumidify while in heating mode (which would be a nice feature.)

The Pacific Northwest does not have humidity issues any time of year (let alone all year) for air maintained at room temp. Ventilation rates (using outdoor air) can handle it without mechanical dehumidification unless you have excessive interior moisture sources, or insist on interior air with dew points below 60F on warmer winter days.  If you overlay both temperature & dew point graphs of the weather history even on foggy-dew coastal OR you generally only get dew points above 60F when it's warm enough to have a sensible cooling load.