Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Vispring Diamond Majesty
King Koil Reserve Luxury
Comfort
9.9/10
9.3/10
Support
9.8/10
8.8/10
Cooling
9.8/10
8.4/10
Edge Support
9.6/10
8.7/10
Motion Isolation
9.7/10
8.3/10
Durability
9.9/10
9/10
Value
6.8/10
7.4/10
Quick Specs Comparison
Spec
Vispring Diamond Majesty
King Koil Reserve Luxury
Price (Queen)
$44,000
$3,799
Type
Handcrafted Triple-Layer Pocket Spring & Noble Fibers
Luxury Pillow-Top Hybrid
Firmness
5.5/10
5.5/10
Height
11 inches
15 inches
Trial
Retailer-dependent; typically 60–100 nights
120 nights
Warranty
30-year guarantee
10 years
Shipping
White-glove delivery through authorized retailers
White glove delivery through retail partners
Key Advantages
Why Choose Vispring Diamond Majesty
- Three hand-nested spring layers — the most sophisticated spring architecture on the market
- Cashmere, silk, Shetland wool and horsetail comfort layers
- Exceptional surface softness without sacrificing deep support
Why Choose King Koil Reserve Luxury
- Genuinely plush pillow-top with natural fiber quilting
- Hand-tufted construction resists body impressions over time
- Strong pressure relief for side sleepers