Lovely car mate, what suspension you've got there prespec? if its Pneumatic than 19 inch allow wills will be filling still comfortable for owners who doesn't have pneumatic suspension 19' wheels won't feel so comfortable as 18' wheels.
That is the full specification
I believe it has 3 setting adaptive suspension so it could be comfortable..
05U - Remote Online
235 - Active Parking Assist with PARKTRONIC
241 - Passenger seat electrically adjustable with memory
246 - Analogue clock
249 - Auto dimming rear-view and driver's exterior mirror
275 - Electric drivers seat & exterior mirrors with memory
287 - Folding rear-seat backrests
413 - Electric panoramic glass sunroof
427 - 7-speed automatic transmission
486 - Sports suspension
500 - Exterior mirrors - electrically folding
513 - Traffic Sign Assist
51U - Roof liner fabric black
531 - COMAND ONLINE
551 - Anti-theft warning system and immobiliser
611 - Ambient lighting - exterior mirrors
631 - LED High Performance Headlamps
736 - black open-pore ash wood trim
772 - AMG bodystyling
776 - Wheel-arch widening for AMG wheels
788 - 19" AMG Multispoke alloy wheels
806 - Technical modifications (06)
810 - Burmester® surround soundsystem
815 - DVD player
871 - HANDS-FREE ACCESS
873 - Front seats - heated
877 - Ambient lighting
881 - Remote boot closing
882 - Alarm system with immobiliser and interior protection
889 - Keyless Go
B16 - Two-pipe exhaust system
B54 - Live Traffic Information
P17 - KEYLESS-GO Comfort-package
P29 - AMG Line Interior
P31 - AMG Line Exterior
P44 - Parking Package
P49 - Mirror Package
R - Right-hand drive
R66 - Run-flat tyres
U22 - Adjustable lumbar support
U26 - Floor mats in black with "AMG" lettering
755 - Tenorite Grey Metallic
267 - Red - Leather
DM6 - AMG Line
DP1 - Premium Plus Package
05B - Owner's Manual and Service Booklet - English
06U - Communications module for use of the Mercedes connect me services
218 - Reversing camera with guidance lines
258 - Collision Prevention Assist
270 - Aerial for GPS
294 - Kneebag driver's side
309 - Double cup holder in centre console for 2 x 750 ml
30P - Stowage Space package
345 - Rain Sensing Windscreen Wipers
350 - Mercedes-Benz emergency call system
440 - Speedtronic cruise control
448 - Touchpad
461 - Instrument cluster with mileage reading
475 - Tyre pressure monitoring system
537 - DAB digital radio tuner
580 - Automatic climate control
666 - Vehicle freight packaging without tie-down loops
875 - Heated windscreen washer system
876 - Interior lighting package
885 - Enhanced anti-theft protection
893 - KEYLESS GO starting function
916 - Fuel tank with increased capacity 66 l
920 - Direct petrol injection with stratified charging
927 - EU6 emissions standard
968 - COC document EU6 without registration certificate part II
989 - Identification label under windshield
B03 - ECO start/stop function
B59 - DYNAMIC SELECT
K11 - Adaptive brake lights
P54 - Anti-Theft Protection Package
R01 - Summer tyres
U01 - Rear belt status indication in the instrument display
U10 - Automatic front passenger airbag deactivation
U25 - Door sill panels with "Mercedes-Benz" lettering, illuminated
U60 - Active bonnet