Luxman 509x VS Luxman 509Z

Hi @simonleboom I was just thinking post a topic about a comparison between the 590II VS 590X, until I saw this. Would you mind sharing some thoughts between the two model. Much appreciate if possible.
My current speaker is

SC-IV/ASC-IV/A

Description: Three-way dynamic loudspeaker. Drive-units: 1" composite textile-dome tweeter, two 5.5" paper-cone midranges, two 10" long-throw paper-cone woofers. Crossover: first-order design (frequencies not specified). Biwire and biamp capability. Frequency response: 25Hz-20kHz, ±1.5dB; -3dB at 20Hz (anechoic). Sensitivity: 92dB/W/m. Impedance: 5 ohms nominal; 3.0 ohms minimum, 7.5 ohms maximum. Recommended amplifier power: 50W minimum into 8 ohms. Recommended listening distance: 8-25'.
Dimensions: 72" H by 12" W by 18" D. Weight: 190 lbs.

Hoping to find some answers which model will match my speaker more. Thanks so much. 

I recently purchased the 509z to replace an older McIntosh Integrated and posted my comments on this thread.

https://forum.audiogon.com/discussions/luxman-505z

The 509Z is better than the 509X, but it's not night and day... I wouldn't replace the X if I had it already, just not enough of a difference to justify the relatively significant cost difference between them.

Some here live deep into this hobby and you’ve really given nothing tangible regarding a system.  One of my several integrated amps is the 509X.  It is loved and fed well, surrounded by great pieces allowing peak performance.

We’ve nothing to work off.  So, whatcha got?