I have listened to both in separate systems but have not compared both side by side. You have to listen to the speakers in your own system to determine if you like them.
A note is the SHL5plus is quite a bit better than the SHL5. An overall more versatile speaker with much improved bass. The SHL5plus does not exhibit the excessive mid-bass lift or bloom of the older 5s and is improved in areas of detail, coherency and smoothness across the frequency spectrum.
In very brief summary, I would describe the Dynaudio C1s to be clean, precise and analytical whilst the SHL5plus is more organic, natural and has a slightly warmer sound.
A note is the SHL5plus is quite a bit better than the SHL5. An overall more versatile speaker with much improved bass. The SHL5plus does not exhibit the excessive mid-bass lift or bloom of the older 5s and is improved in areas of detail, coherency and smoothness across the frequency spectrum.
In very brief summary, I would describe the Dynaudio C1s to be clean, precise and analytical whilst the SHL5plus is more organic, natural and has a slightly warmer sound.