The best analogy is from P55/LGA 1156 {SB or Ivy Bridge/LGA 1155} <= VERSUS => X58/1366 {SB-E/LGA 2011}
The LGA 1155 is considered 'Consumer' level and the LGA 2011 is considered 'Enthusiast or Extreme' level.
General info ->
http://en.wikipedia.org/wiki/Sandy_Bridge#Ivy_Bridge_2
Ivy Bridge/LGA 1155 -
http://en.wikipedia.org/wiki/LGA_1155
March 2012
16 Lanes of PCIe 3.0
~20% increase over Sandy Bridge
Dual (2) Channel memory
4 core / 4 hyper-thread limit
CPU/GPU graphics integrated
Stock HSF included
CPU Multiplier OC only
SB-E/LGA 2011 -
http://en.wikipedia.org/wiki/LGA_2011
October/November 2011
32 Lanes of PCIe 3.0
~45% increase over Sandy Bridge
Quad (4) Channel memory
6/8 (maybe 10) core / 6/8 (maybe 10) hyper-thread limit ; cheapo 4/4 i7-3820 3.6GHz/3.9GHz
Multiple CPU support on Xeon SB-E
Discrete GPU required/no graphics integrated
HSF not included
BCLK + CPU Multiplier OC ; the BCLK is still not 100% confirmed