Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
SFERRA Sonno Notte Luxury Firm
King Koil Reserve Luxury
Comfort
9.3/10
9.3/10
Support
9.7/10
8.8/10
Cooling
9/10
8.4/10
Edge Support
9.5/10
8.7/10
Motion Isolation
9.2/10
8.3/10
Durability
9.8/10
9/10
Value
7.5/10
7.4/10
Quick Specs Comparison
Spec
SFERRA Sonno Notte Luxury Firm
King Koil Reserve Luxury
Price (Queen)
$5,462
$3,799
Type
Luxury Firm Innerspring
Luxury Pillow-Top Hybrid
Firmness
7/10
5.5/10
Height
14.5 inches
15 inches
Trial
30 nights
120 nights
Warranty
10 years
10 years
Shipping
White glove delivery
White glove delivery through retail partners
Key Advantages
Why Choose SFERRA Sonno Notte Luxury Firm
- Exceptional build quality — hand-tufted, made in USA
- Natural Talalay latex comfort layer for responsive support
- Individually pocketed coils minimize motion transfer
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