the major diff between 8085 and 8086 1s 8085 is a 8 bit 
processor 16 address lines where 8086 is a 16 bit with 20 
address lines.

the instructions are different
  

pipelining concept is not seen n 8085

8085 is based on Von-Neumann architecture in which the data
and instructions are in the same memory space without any
distinction between them.8085 is CISC (Complex Instruction
Set Computer.
8085 is a 8 bit processor ie 8 bit data bus. Has got 16
Address Lines. Maximum Operating speed is 3MHz. 8085-A
Operates upto a maximum of 5MHz.
8086 is a 16 bit processor. Has got 20 address lines.
Operates upto 5MHz

8086 has a prefetch queue which is not presebt in 8085. 
Also 8086 cotains 20 address lines.

8085 is Vonneumann architecture in which data and code  is 
shared in the by the same memory . 
8085 is 16 x 8 bit processor where 8086 is 20 x 16 bit 
processor .

8085 is a von neumann architecture. 

8086 has 4 segment registers which are not peresent in 
8085. also it has preftech queue which stores instructions 
ahead of time which is not present in 8085. The BIU and 
execution unit in 8086 works parallely which improves its 
performance. 

8085 is 16*8 bit proc. while 8086 20*16 bit proc.

there are main two diff. bet. 8085-8086..
8085 is 8-bit processor & have 16 address lines.
8086 is 16-bit processor & have 20 address lines.

the major difference is the 8085 have 16 bit address bus 
whereas 8086 have 32 bit address bus.there is no seperate 
instruction set for multiplication and division for 8085.it 
is not so in 8086.